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Finding the Fourth Proportional to 949.40, 1,425.12 and 688.28

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Solution

The fourth proportional to 949.40, 1,425.12 and 688.28 is: 1,033.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.40 : 1,425.12 = 688.28 : x
  2. Step 2: Convert to fraction form
    949.40/1,425.12 = 688.28/x
  3. Step 3: Cross multiply
    949.40x = 1,425.12 × 688.28
  4. Step 4: Simplify right side
    949.40x = 980,881.59
  5. Step 5: Solve for x
    x = 980,881.59/949.40
  6. Step 6: Final answer
    x = 1,033.16

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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.