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Finding the Fourth Proportional to 60,981.60, 91,472.40 and 42,319.20

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Solution

The fourth proportional to 60,981.60, 91,472.40 and 42,319.20 is: 63,478.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,981.60 : 91,472.40 = 42,319.20 : x
  2. Step 2: Convert to fraction form
    60,981.60/91,472.40 = 42,319.20/x
  3. Step 3: Cross multiply
    60,981.60x = 91,472.40 × 42,319.20
  4. Step 4: Simplify right side
    60,981.60x = 3,871,038,790.08
  5. Step 5: Solve for x
    x = 3,871,038,790.08/60,981.60
  6. Step 6: Final answer
    x = 63,478.80

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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.