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Finding the Fourth Proportional to 91,859.60, 137,789.40 and 65,421.20

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Solution

The fourth proportional to 91,859.60, 137,789.40 and 65,421.20 is: 98,131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,859.60 : 137,789.40 = 65,421.20 : x
  2. Step 2: Convert to fraction form
    91,859.60/137,789.40 = 65,421.20/x
  3. Step 3: Cross multiply
    91,859.60x = 137,789.40 × 65,421.20
  4. Step 4: Simplify right side
    91,859.60x = 9,014,347,895.28
  5. Step 5: Solve for x
    x = 9,014,347,895.28/91,859.60
  6. Step 6: Final answer
    x = 98,131.80

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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.