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Finding the Fourth Proportional to 925.61, 1,389.12 and 439.00

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Solution

The fourth proportional to 925.61, 1,389.12 and 439.00 is: 658.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.61 : 1,389.12 = 439.00 : x
  2. Step 2: Convert to fraction form
    925.61/1,389.12 = 439.00/x
  3. Step 3: Cross multiply
    925.61x = 1,389.12 × 439.00
  4. Step 4: Simplify right side
    925.61x = 609,823.77
  5. Step 5: Solve for x
    x = 609,823.77/925.61
  6. Step 6: Final answer
    x = 658.84

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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.