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Finding the Fourth Proportional to 924.72, 1,386.15 and 436.90

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Solution

The fourth proportional to 924.72, 1,386.15 and 436.90 is: 654.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.72 : 1,386.15 = 436.90 : x
  2. Step 2: Convert to fraction form
    924.72/1,386.15 = 436.90/x
  3. Step 3: Cross multiply
    924.72x = 1,386.15 × 436.90
  4. Step 4: Simplify right side
    924.72x = 605,608.94
  5. Step 5: Solve for x
    x = 605,608.94/924.72
  6. Step 6: Final answer
    x = 654.91

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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.