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Finding the Fourth Proportional to 85,766.34, 128,675.97 and 38,421.30

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Solution

The fourth proportional to 85,766.34, 128,675.97 and 38,421.30 is: 57,643.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,766.34 : 128,675.97 = 38,421.30 : x
  2. Step 2: Convert to fraction form
    85,766.34/128,675.97 = 38,421.30/x
  3. Step 3: Cross multiply
    85,766.34x = 128,675.97 × 38,421.30
  4. Step 4: Simplify right side
    85,766.34x = 4,943,898,046.16
  5. Step 5: Solve for x
    x = 4,943,898,046.16/85,766.34
  6. Step 6: Final answer
    x = 57,643.80

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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.