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Finding the Fourth Proportional to 938.79, 1,408.19 and 572.87

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Solution

The fourth proportional to 938.79, 1,408.19 and 572.87 is: 859.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.79 : 1,408.19 = 572.87 : x
  2. Step 2: Convert to fraction form
    938.79/1,408.19 = 572.87/x
  3. Step 3: Cross multiply
    938.79x = 1,408.19 × 572.87
  4. Step 4: Simplify right side
    938.79x = 806,710.46
  5. Step 5: Solve for x
    x = 806,710.46/938.79
  6. Step 6: Final answer
    x = 859.31

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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.