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Finding the Fourth Proportional to 85,842.70, 128,909.85 and 63,681.10

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Solution

The fourth proportional to 85,842.70, 128,909.85 and 63,681.10 is: 95,629.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,842.70 : 128,909.85 = 63,681.10 : x
  2. Step 2: Convert to fraction form
    85,842.70/128,909.85 = 63,681.10/x
  3. Step 3: Cross multiply
    85,842.70x = 128,909.85 × 63,681.10
  4. Step 4: Simplify right side
    85,842.70x = 8,209,121,048.84
  5. Step 5: Solve for x
    x = 8,209,121,048.84/85,842.70
  6. Step 6: Final answer
    x = 95,629.81

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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.