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Finding the Fourth Proportional to 929.12, 1,281.96 and 515.12

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Solution

The fourth proportional to 929.12, 1,281.96 and 515.12 is: 710.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.12 : 1,281.96 = 515.12 : x
  2. Step 2: Convert to fraction form
    929.12/1,281.96 = 515.12/x
  3. Step 3: Cross multiply
    929.12x = 1,281.96 × 515.12
  4. Step 4: Simplify right side
    929.12x = 660,363.24
  5. Step 5: Solve for x
    x = 660,363.24/929.12
  6. Step 6: Final answer
    x = 710.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.