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Finding the Fourth Proportional to 925.65, 1,378.65 and 921.18

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Solution

The fourth proportional to 925.65, 1,378.65 and 921.18 is: 1,371.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.65 : 1,378.65 = 921.18 : x
  2. Step 2: Convert to fraction form
    925.65/1,378.65 = 921.18/x
  3. Step 3: Cross multiply
    925.65x = 1,378.65 × 921.18
  4. Step 4: Simplify right side
    925.65x = 1,269,984.81
  5. Step 5: Solve for x
    x = 1,269,984.81/925.65
  6. Step 6: Final answer
    x = 1,371.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.