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Finding the Fourth Proportional to 500.61, 691.10 and 388.33

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Solution

The fourth proportional to 500.61, 691.10 and 388.33 is: 536.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.61 : 691.10 = 388.33 : x
  2. Step 2: Convert to fraction form
    500.61/691.10 = 388.33/x
  3. Step 3: Cross multiply
    500.61x = 691.10 × 388.33
  4. Step 4: Simplify right side
    500.61x = 268,374.86
  5. Step 5: Solve for x
    x = 268,374.86/500.61
  6. Step 6: Final answer
    x = 536.10

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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.