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Finding the Fourth Proportional to 1,625.40, 2,243.07 and 987.16

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Solution

The fourth proportional to 1,625.40, 2,243.07 and 987.16 is: 1,362.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,625.40 : 2,243.07 = 987.16 : x
  2. Step 2: Convert to fraction form
    1,625.40/2,243.07 = 987.16/x
  3. Step 3: Cross multiply
    1,625.40x = 2,243.07 × 987.16
  4. Step 4: Simplify right side
    1,625.40x = 2,214,268.98
  5. Step 5: Solve for x
    x = 2,214,268.98/1,625.40
  6. Step 6: Final answer
    x = 1,362.29

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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.