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Finding the Fourth Proportional to 1,281.08, 1,920.18 and 632.28

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Solution

The fourth proportional to 1,281.08, 1,920.18 and 632.28 is: 947.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.08 : 1,920.18 = 632.28 : x
  2. Step 2: Convert to fraction form
    1,281.08/1,920.18 = 632.28/x
  3. Step 3: Cross multiply
    1,281.08x = 1,920.18 × 632.28
  4. Step 4: Simplify right side
    1,281.08x = 1,214,091.41
  5. Step 5: Solve for x
    x = 1,214,091.41/1,281.08
  6. Step 6: Final answer
    x = 947.71

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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.