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Finding the Fourth Proportional to 938.57, 1,406.93 and 390.22

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Solution

The fourth proportional to 938.57, 1,406.93 and 390.22 is: 584.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.57 : 1,406.93 = 390.22 : x
  2. Step 2: Convert to fraction form
    938.57/1,406.93 = 390.22/x
  3. Step 3: Cross multiply
    938.57x = 1,406.93 × 390.22
  4. Step 4: Simplify right side
    938.57x = 549,006.76
  5. Step 5: Solve for x
    x = 549,006.76/938.57
  6. Step 6: Final answer
    x = 584.94

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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.