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Finding the Fourth Proportional to 938.54, 1,295.08 and 518.87

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Solution

The fourth proportional to 938.54, 1,295.08 and 518.87 is: 715.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.54 : 1,295.08 = 518.87 : x
  2. Step 2: Convert to fraction form
    938.54/1,295.08 = 518.87/x
  3. Step 3: Cross multiply
    938.54x = 1,295.08 × 518.87
  4. Step 4: Simplify right side
    938.54x = 671,978.16
  5. Step 5: Solve for x
    x = 671,978.16/938.54
  6. Step 6: Final answer
    x = 715.98

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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.