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Finding the Fourth Proportional to 42,502.57, 58,665.90 and 28,355.38

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Solution

The fourth proportional to 42,502.57, 58,665.90 and 28,355.38 is: 39,138.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,502.57 : 58,665.90 = 28,355.38 : x
  2. Step 2: Convert to fraction form
    42,502.57/58,665.90 = 28,355.38/x
  3. Step 3: Cross multiply
    42,502.57x = 58,665.90 × 28,355.38
  4. Step 4: Simplify right side
    42,502.57x = 1,663,493,887.54
  5. Step 5: Solve for x
    x = 1,663,493,887.54/42,502.57
  6. Step 6: Final answer
    x = 39,138.67

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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.