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Finding the Fourth Proportional to 85,747.78, 128,700.63 and 43,657.95

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Solution

The fourth proportional to 85,747.78, 128,700.63 and 43,657.95 is: 65,527.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,747.78 : 128,700.63 = 43,657.95 : x
  2. Step 2: Convert to fraction form
    85,747.78/128,700.63 = 43,657.95/x
  3. Step 3: Cross multiply
    85,747.78x = 128,700.63 × 43,657.95
  4. Step 4: Simplify right side
    85,747.78x = 5,618,806,152.14
  5. Step 5: Solve for x
    x = 5,618,806,152.14/85,747.78
  6. Step 6: Final answer
    x = 65,527.13

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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.