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Finding the Fourth Proportional to 869.46, 1,310.06 and 718.76

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Solution

The fourth proportional to 869.46, 1,310.06 and 718.76 is: 1,082.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.46 : 1,310.06 = 718.76 : x
  2. Step 2: Convert to fraction form
    869.46/1,310.06 = 718.76/x
  3. Step 3: Cross multiply
    869.46x = 1,310.06 × 718.76
  4. Step 4: Simplify right side
    869.46x = 941,618.73
  5. Step 5: Solve for x
    x = 941,618.73/869.46
  6. Step 6: Final answer
    x = 1,082.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.