Home / 1,280.60-1,920.95-500.57

Finding the Fourth Proportional to 1,280.60, 1,920.95 and 500.57

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Solution

The fourth proportional to 1,280.60, 1,920.95 and 500.57 is: 750.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.60 : 1,920.95 = 500.57 : x
  2. Step 2: Convert to fraction form
    1,280.60/1,920.95 = 500.57/x
  3. Step 3: Cross multiply
    1,280.60x = 1,920.95 × 500.57
  4. Step 4: Simplify right side
    1,280.60x = 961,572.24
  5. Step 5: Solve for x
    x = 961,572.24/1,280.60
  6. Step 6: Final answer
    x = 750.87

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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.