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Finding the Fourth Proportional to 85,805.20, 128,707.80 and 72,715.60

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Solution

The fourth proportional to 85,805.20, 128,707.80 and 72,715.60 is: 109,073.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,805.20 : 128,707.80 = 72,715.60 : x
  2. Step 2: Convert to fraction form
    85,805.20/128,707.80 = 72,715.60/x
  3. Step 3: Cross multiply
    85,805.20x = 128,707.80 × 72,715.60
  4. Step 4: Simplify right side
    85,805.20x = 9,359,064,901.68
  5. Step 5: Solve for x
    x = 9,359,064,901.68/85,805.20
  6. Step 6: Final answer
    x = 109,073.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.