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Finding the Fourth Proportional to 874.38, 1,312.74 and 561.18

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Solution

The fourth proportional to 874.38, 1,312.74 and 561.18 is: 842.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.38 : 1,312.74 = 561.18 : x
  2. Step 2: Convert to fraction form
    874.38/1,312.74 = 561.18/x
  3. Step 3: Cross multiply
    874.38x = 1,312.74 × 561.18
  4. Step 4: Simplify right side
    874.38x = 736,683.43
  5. Step 5: Solve for x
    x = 736,683.43/874.38
  6. Step 6: Final answer
    x = 842.52

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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.