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Finding the Fourth Proportional to 875.32, 1,312.96 and 298.20

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Solution

The fourth proportional to 875.32, 1,312.96 and 298.20 is: 447.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.32 : 1,312.96 = 298.20 : x
  2. Step 2: Convert to fraction form
    875.32/1,312.96 = 298.20/x
  3. Step 3: Cross multiply
    875.32x = 1,312.96 × 298.20
  4. Step 4: Simplify right side
    875.32x = 391,524.67
  5. Step 5: Solve for x
    x = 391,524.67/875.32
  6. Step 6: Final answer
    x = 447.29

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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.