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Finding the Fourth Proportional to 871.24, 1,307.96 and 690.88

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Solution

The fourth proportional to 871.24, 1,307.96 and 690.88 is: 1,037.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.24 : 1,307.96 = 690.88 : x
  2. Step 2: Convert to fraction form
    871.24/1,307.96 = 690.88/x
  3. Step 3: Cross multiply
    871.24x = 1,307.96 × 690.88
  4. Step 4: Simplify right side
    871.24x = 903,643.40
  5. Step 5: Solve for x
    x = 903,643.40/871.24
  6. Step 6: Final answer
    x = 1,037.19

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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.