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Finding the Fourth Proportional to 924.61, 1,386.55 and 411.25

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Solution

The fourth proportional to 924.61, 1,386.55 and 411.25 is: 616.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.61 : 1,386.55 = 411.25 : x
  2. Step 2: Convert to fraction form
    924.61/1,386.55 = 411.25/x
  3. Step 3: Cross multiply
    924.61x = 1,386.55 × 411.25
  4. Step 4: Simplify right side
    924.61x = 570,218.69
  5. Step 5: Solve for x
    x = 570,218.69/924.61
  6. Step 6: Final answer
    x = 616.71

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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.