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Finding the Fourth Proportional to 91,421.60, 137,073.20 and 38,816.80

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Solution

The fourth proportional to 91,421.60, 137,073.20 and 38,816.80 is: 58,200.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,421.60 : 137,073.20 = 38,816.80 : x
  2. Step 2: Convert to fraction form
    91,421.60/137,073.20 = 38,816.80/x
  3. Step 3: Cross multiply
    91,421.60x = 137,073.20 × 38,816.80
  4. Step 4: Simplify right side
    91,421.60x = 5,320,742,989.76
  5. Step 5: Solve for x
    x = 5,320,742,989.76/91,421.60
  6. Step 6: Final answer
    x = 58,200.06

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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.