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Finding the Fourth Proportional to 925.97, 1,389.35 and 720.23

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Solution

The fourth proportional to 925.97, 1,389.35 and 720.23 is: 1,080.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.97 : 1,389.35 = 720.23 : x
  2. Step 2: Convert to fraction form
    925.97/1,389.35 = 720.23/x
  3. Step 3: Cross multiply
    925.97x = 1,389.35 × 720.23
  4. Step 4: Simplify right side
    925.97x = 1,000,646.40
  5. Step 5: Solve for x
    x = 1,000,646.40/925.97
  6. Step 6: Final answer
    x = 1,080.65

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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.