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Finding the Fourth Proportional to 91,378.56, 137,059.52 and 64,838.40

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Solution

The fourth proportional to 91,378.56, 137,059.52 and 64,838.40 is: 97,251.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,378.56 : 137,059.52 = 64,838.40 : x
  2. Step 2: Convert to fraction form
    91,378.56/137,059.52 = 64,838.40/x
  3. Step 3: Cross multiply
    91,378.56x = 137,059.52 × 64,838.40
  4. Step 4: Simplify right side
    91,378.56x = 8,886,719,981.57
  5. Step 5: Solve for x
    x = 8,886,719,981.57/91,378.56
  6. Step 6: Final answer
    x = 97,251.70

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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.