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Finding the Fourth Proportional to 874.72, 1,312.08 and 489.76

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Solution

The fourth proportional to 874.72, 1,312.08 and 489.76 is: 734.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.72 : 1,312.08 = 489.76 : x
  2. Step 2: Convert to fraction form
    874.72/1,312.08 = 489.76/x
  3. Step 3: Cross multiply
    874.72x = 1,312.08 × 489.76
  4. Step 4: Simplify right side
    874.72x = 642,604.30
  5. Step 5: Solve for x
    x = 642,604.30/874.72
  6. Step 6: Final answer
    x = 734.64

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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.