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Finding the Fourth Proportional to 1,281.14, 1,921.17 and 631.52

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Solution

The fourth proportional to 1,281.14, 1,921.17 and 631.52 is: 947.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.14 : 1,921.17 = 631.52 : x
  2. Step 2: Convert to fraction form
    1,281.14/1,921.17 = 631.52/x
  3. Step 3: Cross multiply
    1,281.14x = 1,921.17 × 631.52
  4. Step 4: Simplify right side
    1,281.14x = 1,213,257.28
  5. Step 5: Solve for x
    x = 1,213,257.28/1,281.14
  6. Step 6: Final answer
    x = 947.01

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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.