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Finding the Fourth Proportional to 1,649.97, 2,276.89 and 987.19

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Solution

The fourth proportional to 1,649.97, 2,276.89 and 987.19 is: 1,362.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,649.97 : 2,276.89 = 987.19 : x
  2. Step 2: Convert to fraction form
    1,649.97/2,276.89 = 987.19/x
  3. Step 3: Cross multiply
    1,649.97x = 2,276.89 × 987.19
  4. Step 4: Simplify right side
    1,649.97x = 2,247,723.04
  5. Step 5: Solve for x
    x = 2,247,723.04/1,649.97
  6. Step 6: Final answer
    x = 1,362.28

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,650.97, 2,278.27 and 988.19
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.