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Finding the Fourth Proportional to 1,650.75, 2,278.04 and 987.63

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Solution

The fourth proportional to 1,650.75, 2,278.04 and 987.63 is: 1,362.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,650.75 : 2,278.04 = 987.63 : x
  2. Step 2: Convert to fraction form
    1,650.75/2,278.04 = 987.63/x
  3. Step 3: Cross multiply
    1,650.75x = 2,278.04 × 987.63
  4. Step 4: Simplify right side
    1,650.75x = 2,249,855.71
  5. Step 5: Solve for x
    x = 2,249,855.71/1,650.75
  6. Step 6: Final answer
    x = 1,362.93

Related Problems

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Half scale
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Double scale
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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.