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Finding the Fourth Proportional to 71,187.20, 106,780.80 and 61,971.20

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Solution

The fourth proportional to 71,187.20, 106,780.80 and 61,971.20 is: 92,956.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,187.20 : 106,780.80 = 61,971.20 : x
  2. Step 2: Convert to fraction form
    71,187.20/106,780.80 = 61,971.20/x
  3. Step 3: Cross multiply
    71,187.20x = 106,780.80 × 61,971.20
  4. Step 4: Simplify right side
    71,187.20x = 6,617,334,312.96
  5. Step 5: Solve for x
    x = 6,617,334,312.96/71,187.20
  6. Step 6: Final answer
    x = 92,956.80

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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.