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Finding the Fourth Proportional to 387.87, 578.92 and 348.99

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Solution

The fourth proportional to 387.87, 578.92 and 348.99 is: 520.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.87 : 578.92 = 348.99 : x
  2. Step 2: Convert to fraction form
    387.87/578.92 = 348.99/x
  3. Step 3: Cross multiply
    387.87x = 578.92 × 348.99
  4. Step 4: Simplify right side
    387.87x = 202,036.42
  5. Step 5: Solve for x
    x = 202,036.42/387.87
  6. Step 6: Final answer
    x = 520.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.