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Finding the Fourth Proportional to 874.66, 1,312.53 and 490.18

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Solution

The fourth proportional to 874.66, 1,312.53 and 490.18 is: 735.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.66 : 1,312.53 = 490.18 : x
  2. Step 2: Convert to fraction form
    874.66/1,312.53 = 490.18/x
  3. Step 3: Cross multiply
    874.66x = 1,312.53 × 490.18
  4. Step 4: Simplify right side
    874.66x = 643,375.96
  5. Step 5: Solve for x
    x = 643,375.96/874.66
  6. Step 6: Final answer
    x = 735.57

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Double scale
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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.