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Finding the Fourth Proportional to 98,640.72, 147,954.60 and 42,478.56

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Solution

The fourth proportional to 98,640.72, 147,954.60 and 42,478.56 is: 63,715.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,640.72 : 147,954.60 = 42,478.56 : x
  2. Step 2: Convert to fraction form
    98,640.72/147,954.60 = 42,478.56/x
  3. Step 3: Cross multiply
    98,640.72x = 147,954.60 × 42,478.56
  4. Step 4: Simplify right side
    98,640.72x = 6,284,898,353.38
  5. Step 5: Solve for x
    x = 6,284,898,353.38/98,640.72
  6. Step 6: Final answer
    x = 63,715.05

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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.