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Finding the Fourth Proportional to 951.40, 1,312.90 and 531.75

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Solution

The fourth proportional to 951.40, 1,312.90 and 531.75 is: 733.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.40 : 1,312.90 = 531.75 : x
  2. Step 2: Convert to fraction form
    951.40/1,312.90 = 531.75/x
  3. Step 3: Cross multiply
    951.40x = 1,312.90 × 531.75
  4. Step 4: Simplify right side
    951.40x = 698,137.82
  5. Step 5: Solve for x
    x = 698,137.82/951.40
  6. Step 6: Final answer
    x = 733.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.