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Finding the Fourth Proportional to 875.53, 1,312.89 and 490.78

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Solution

The fourth proportional to 875.53, 1,312.89 and 490.78 is: 735.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.53 : 1,312.89 = 490.78 : x
  2. Step 2: Convert to fraction form
    875.53/1,312.89 = 490.78/x
  3. Step 3: Cross multiply
    875.53x = 1,312.89 × 490.78
  4. Step 4: Simplify right side
    875.53x = 644,340.15
  5. Step 5: Solve for x
    x = 644,340.15/875.53
  6. Step 6: Final answer
    x = 735.94

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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.