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Finding the Fourth Proportional to 753.61, 1,129.50 and 319.85

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Solution

The fourth proportional to 753.61, 1,129.50 and 319.85 is: 479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.61 : 1,129.50 = 319.85 : x
  2. Step 2: Convert to fraction form
    753.61/1,129.50 = 319.85/x
  3. Step 3: Cross multiply
    753.61x = 1,129.50 × 319.85
  4. Step 4: Simplify right side
    753.61x = 361,271.44
  5. Step 5: Solve for x
    x = 361,271.44/753.61
  6. Step 6: Final answer
    x = 479.39

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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.