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Finding the Fourth Proportional to 924.18, 1,386.20 and 307.86

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Solution

The fourth proportional to 924.18, 1,386.20 and 307.86 is: 461.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.18 : 1,386.20 = 307.86 : x
  2. Step 2: Convert to fraction form
    924.18/1,386.20 = 307.86/x
  3. Step 3: Cross multiply
    924.18x = 1,386.20 × 307.86
  4. Step 4: Simplify right side
    924.18x = 426,755.53
  5. Step 5: Solve for x
    x = 426,755.53/924.18
  6. Step 6: Final answer
    x = 461.77

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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.