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Finding the Fourth Proportional to 929.32, 1,391.10 and 543.40

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Solution

The fourth proportional to 929.32, 1,391.10 and 543.40 is: 813.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.32 : 1,391.10 = 543.40 : x
  2. Step 2: Convert to fraction form
    929.32/1,391.10 = 543.40/x
  3. Step 3: Cross multiply
    929.32x = 1,391.10 × 543.40
  4. Step 4: Simplify right side
    929.32x = 755,923.74
  5. Step 5: Solve for x
    x = 755,923.74/929.32
  6. Step 6: Final answer
    x = 813.42

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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.