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Finding the Fourth Proportional to 951.78, 1,312.29 and 689.70

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Solution

The fourth proportional to 951.78, 1,312.29 and 689.70 is: 950.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.78 : 1,312.29 = 689.70 : x
  2. Step 2: Convert to fraction form
    951.78/1,312.29 = 689.70/x
  3. Step 3: Cross multiply
    951.78x = 1,312.29 × 689.70
  4. Step 4: Simplify right side
    951.78x = 905,086.41
  5. Step 5: Solve for x
    x = 905,086.41/951.78
  6. Step 6: Final answer
    x = 950.94

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1.5x scale

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.