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Finding the Fourth Proportional to 1,281.95, 1,920.96 and 760.92

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Solution

The fourth proportional to 1,281.95, 1,920.96 and 760.92 is: 1,140.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.95 : 1,920.96 = 760.92 : x
  2. Step 2: Convert to fraction form
    1,281.95/1,920.96 = 760.92/x
  3. Step 3: Cross multiply
    1,281.95x = 1,920.96 × 760.92
  4. Step 4: Simplify right side
    1,281.95x = 1,461,696.88
  5. Step 5: Solve for x
    x = 1,461,696.88/1,281.95
  6. Step 6: Final answer
    x = 1,140.22

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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.