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Finding the Fourth Proportional to 85,812,785.20, 128,719,177.80 and 85,812,785.20

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Solution

The fourth proportional to 85,812,785.20, 128,719,177.80 and 85,812,785.20 is: 128,719,177.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812,785.20 : 128,719,177.80 = 85,812,785.20 : x
  2. Step 2: Convert to fraction form
    85,812,785.20/128,719,177.80 = 85,812,785.20/x
  3. Step 3: Cross multiply
    85,812,785.20x = 128,719,177.80 × 85,812,785.20
  4. Step 4: Simplify right side
    85,812,785.20x = 11,045,751,155,672,008
  5. Step 5: Solve for x
    x = 11,045,751,155,672,008/85,812,785.20
  6. Step 6: Final answer
    x = 128,719,177.80

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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.