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Finding the Fourth Proportional to 925.91, 1,389.13 and 310.02

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Solution

The fourth proportional to 925.91, 1,389.13 and 310.02 is: 465.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.91 : 1,389.13 = 310.02 : x
  2. Step 2: Convert to fraction form
    925.91/1,389.13 = 310.02/x
  3. Step 3: Cross multiply
    925.91x = 1,389.13 × 310.02
  4. Step 4: Simplify right side
    925.91x = 430,658.08
  5. Step 5: Solve for x
    x = 430,658.08/925.91
  6. Step 6: Final answer
    x = 465.12

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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.