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Finding the Fourth Proportional to 100,485, 138,669.84 and 62,781.12

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Solution

The fourth proportional to 100,485, 138,669.84 and 62,781.12 is: 86,638.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,485 : 138,669.84 = 62,781.12 : x
  2. Step 2: Convert to fraction form
    100,485/138,669.84 = 62,781.12/x
  3. Step 3: Cross multiply
    100,485x = 138,669.84 × 62,781.12
  4. Step 4: Simplify right side
    100,485x = 8,705,847,865.42
  5. Step 5: Solve for x
    x = 8,705,847,865.42/100,485
  6. Step 6: Final answer
    x = 86,638.28

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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.