Home / 1,280.07-1,920.21-500.45

Finding the Fourth Proportional to 1,280.07, 1,920.21 and 500.45

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Solution

The fourth proportional to 1,280.07, 1,920.21 and 500.45 is: 750.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.07 : 1,920.21 = 500.45 : x
  2. Step 2: Convert to fraction form
    1,280.07/1,920.21 = 500.45/x
  3. Step 3: Cross multiply
    1,280.07x = 1,920.21 × 500.45
  4. Step 4: Simplify right side
    1,280.07x = 960,957.62
  5. Step 5: Solve for x
    x = 960,957.62/1,280.07
  6. Step 6: Final answer
    x = 750.71

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Double scale
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1.5x scale

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.