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Finding the Fourth Proportional to 389.90, 583.91 and 372.35

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Solution

The fourth proportional to 389.90, 583.91 and 372.35 is: 557.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.90 : 583.91 = 372.35 : x
  2. Step 2: Convert to fraction form
    389.90/583.91 = 372.35/x
  3. Step 3: Cross multiply
    389.90x = 583.91 × 372.35
  4. Step 4: Simplify right side
    389.90x = 217,417.03
  5. Step 5: Solve for x
    x = 217,417.03/389.90
  6. Step 6: Final answer
    x = 557.62

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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.