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Finding the Fourth Proportional to 1,281.74, 1,922.00 and 631.71

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Solution

The fourth proportional to 1,281.74, 1,922.00 and 631.71 is: 947.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.74 : 1,922.00 = 631.71 : x
  2. Step 2: Convert to fraction form
    1,281.74/1,922.00 = 631.71/x
  3. Step 3: Cross multiply
    1,281.74x = 1,922.00 × 631.71
  4. Step 4: Simplify right side
    1,281.74x = 1,214,143.46
  5. Step 5: Solve for x
    x = 1,214,143.46/1,281.74
  6. Step 6: Final answer
    x = 947.27

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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.