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Finding the Fourth Proportional to 926.45, 1,387.85 and 487.05

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Solution

The fourth proportional to 926.45, 1,387.85 and 487.05 is: 729.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.45 : 1,387.85 = 487.05 : x
  2. Step 2: Convert to fraction form
    926.45/1,387.85 = 487.05/x
  3. Step 3: Cross multiply
    926.45x = 1,387.85 × 487.05
  4. Step 4: Simplify right side
    926.45x = 675,952.34
  5. Step 5: Solve for x
    x = 675,952.34/926.45
  6. Step 6: Final answer
    x = 729.62

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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.