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Finding the Fourth Proportional to 62,420.80, 93,631.20 and 20,862.40

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Solution

The fourth proportional to 62,420.80, 93,631.20 and 20,862.40 is: 31,293.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,420.80 : 93,631.20 = 20,862.40 : x
  2. Step 2: Convert to fraction form
    62,420.80/93,631.20 = 20,862.40/x
  3. Step 3: Cross multiply
    62,420.80x = 93,631.20 × 20,862.40
  4. Step 4: Simplify right side
    62,420.80x = 1,953,371,546.88
  5. Step 5: Solve for x
    x = 1,953,371,546.88/62,420.80
  6. Step 6: Final answer
    x = 31,293.60

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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.