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Finding the Fourth Proportional to 85,298.00, 128,057.87 and 65,590.40

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Solution

The fourth proportional to 85,298.00, 128,057.87 and 65,590.40 is: 98,470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,298.00 : 128,057.87 = 65,590.40 : x
  2. Step 2: Convert to fraction form
    85,298.00/128,057.87 = 65,590.40/x
  3. Step 3: Cross multiply
    85,298.00x = 128,057.87 × 65,590.40
  4. Step 4: Simplify right side
    85,298.00x = 8,399,366,440.13
  5. Step 5: Solve for x
    x = 8,399,366,440.13/85,298.00
  6. Step 6: Final answer
    x = 98,470.85

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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.