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Finding the Fourth Proportional to 830.32, 1,242.92 and 521.10

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Solution

The fourth proportional to 830.32, 1,242.92 and 521.10 is: 780.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.32 : 1,242.92 = 521.10 : x
  2. Step 2: Convert to fraction form
    830.32/1,242.92 = 521.10/x
  3. Step 3: Cross multiply
    830.32x = 1,242.92 × 521.10
  4. Step 4: Simplify right side
    830.32x = 647,685.61
  5. Step 5: Solve for x
    x = 647,685.61/830.32
  6. Step 6: Final answer
    x = 780.04

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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.