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Finding the Fourth Proportional to 388.13, 534.87 and 358.70

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Solution

The fourth proportional to 388.13, 534.87 and 358.70 is: 494.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.13 : 534.87 = 358.70 : x
  2. Step 2: Convert to fraction form
    388.13/534.87 = 358.70/x
  3. Step 3: Cross multiply
    388.13x = 534.87 × 358.70
  4. Step 4: Simplify right side
    388.13x = 191,855.19
  5. Step 5: Solve for x
    x = 191,855.19/388.13
  6. Step 6: Final answer
    x = 494.31

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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.