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Finding the Fourth Proportional to 749.68, 1,129.96 and 688.12

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Solution

The fourth proportional to 749.68, 1,129.96 and 688.12 is: 1,037.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.68 : 1,129.96 = 688.12 : x
  2. Step 2: Convert to fraction form
    749.68/1,129.96 = 688.12/x
  3. Step 3: Cross multiply
    749.68x = 1,129.96 × 688.12
  4. Step 4: Simplify right side
    749.68x = 777,548.08
  5. Step 5: Solve for x
    x = 777,548.08/749.68
  6. Step 6: Final answer
    x = 1,037.17

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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.