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Finding the Fourth Proportional to 100,887.39, 139,177.80 and 65,088.90

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Solution

The fourth proportional to 100,887.39, 139,177.80 and 65,088.90 is: 89,792.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,887.39 : 139,177.80 = 65,088.90 : x
  2. Step 2: Convert to fraction form
    100,887.39/139,177.80 = 65,088.90/x
  3. Step 3: Cross multiply
    100,887.39x = 139,177.80 × 65,088.90
  4. Step 4: Simplify right side
    100,887.39x = 9,058,929,906.42
  5. Step 5: Solve for x
    x = 9,058,929,906.42/100,887.39
  6. Step 6: Final answer
    x = 89,792.49

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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.