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Finding the Fourth Proportional to 437.57, 604.13 and 390.87

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Solution

The fourth proportional to 437.57, 604.13 and 390.87 is: 539.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.57 : 604.13 = 390.87 : x
  2. Step 2: Convert to fraction form
    437.57/604.13 = 390.87/x
  3. Step 3: Cross multiply
    437.57x = 604.13 × 390.87
  4. Step 4: Simplify right side
    437.57x = 236,136.29
  5. Step 5: Solve for x
    x = 236,136.29/437.57
  6. Step 6: Final answer
    x = 539.65

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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.