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Finding the Fourth Proportional to 71,956.78, 99,300.45 and 39,690.68

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Solution

The fourth proportional to 71,956.78, 99,300.45 and 39,690.68 is: 54,773.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,956.78 : 99,300.45 = 39,690.68 : x
  2. Step 2: Convert to fraction form
    71,956.78/99,300.45 = 39,690.68/x
  3. Step 3: Cross multiply
    71,956.78x = 99,300.45 × 39,690.68
  4. Step 4: Simplify right side
    71,956.78x = 3,941,301,888.30
  5. Step 5: Solve for x
    x = 3,941,301,888.30/71,956.78
  6. Step 6: Final answer
    x = 54,773.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.