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Finding the Fourth Proportional to 926.20, 1,387.70 and 439.16

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Solution

The fourth proportional to 926.20, 1,387.70 and 439.16 is: 657.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.20 : 1,387.70 = 439.16 : x
  2. Step 2: Convert to fraction form
    926.20/1,387.70 = 439.16/x
  3. Step 3: Cross multiply
    926.20x = 1,387.70 × 439.16
  4. Step 4: Simplify right side
    926.20x = 609,422.33
  5. Step 5: Solve for x
    x = 609,422.33/926.20
  6. Step 6: Final answer
    x = 657.98

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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.