Home / 5,280.88-7,920.60-1,385.32

Finding the Fourth Proportional to 5,280.88, 7,920.60 and 1,385.32

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Solution

The fourth proportional to 5,280.88, 7,920.60 and 1,385.32 is: 2,077.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.88 : 7,920.60 = 1,385.32 : x
  2. Step 2: Convert to fraction form
    5,280.88/7,920.60 = 1,385.32/x
  3. Step 3: Cross multiply
    5,280.88x = 7,920.60 × 1,385.32
  4. Step 4: Simplify right side
    5,280.88x = 10,972,565.59
  5. Step 5: Solve for x
    x = 10,972,565.59/5,280.88
  6. Step 6: Final answer
    x = 2,077.79

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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.