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Finding the Fourth Proportional to 64,926.72, 89,659.50 and 47,780.64

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Solution

The fourth proportional to 64,926.72, 89,659.50 and 47,780.64 is: 65,981.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,926.72 : 89,659.50 = 47,780.64 : x
  2. Step 2: Convert to fraction form
    64,926.72/89,659.50 = 47,780.64/x
  3. Step 3: Cross multiply
    64,926.72x = 89,659.50 × 47,780.64
  4. Step 4: Simplify right side
    64,926.72x = 4,283,988,292.08
  5. Step 5: Solve for x
    x = 4,283,988,292.08/64,926.72
  6. Step 6: Final answer
    x = 65,981.90

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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.