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Finding the Fourth Proportional to 1,355.62, 2,031.80 and 489.46

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Solution

The fourth proportional to 1,355.62, 2,031.80 and 489.46 is: 733.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.62 : 2,031.80 = 489.46 : x
  2. Step 2: Convert to fraction form
    1,355.62/2,031.80 = 489.46/x
  3. Step 3: Cross multiply
    1,355.62x = 2,031.80 × 489.46
  4. Step 4: Simplify right side
    1,355.62x = 994,484.83
  5. Step 5: Solve for x
    x = 994,484.83/1,355.62
  6. Step 6: Final answer
    x = 733.60

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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.