Home / 5,385.72-8,078.64-1,687.80

Finding the Fourth Proportional to 5,385.72, 8,078.64 and 1,687.80

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Solution

The fourth proportional to 5,385.72, 8,078.64 and 1,687.80 is: 2,531.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,385.72 : 8,078.64 = 1,687.80 : x
  2. Step 2: Convert to fraction form
    5,385.72/8,078.64 = 1,687.80/x
  3. Step 3: Cross multiply
    5,385.72x = 8,078.64 × 1,687.80
  4. Step 4: Simplify right side
    5,385.72x = 13,635,128.59
  5. Step 5: Solve for x
    x = 13,635,128.59/5,385.72
  6. Step 6: Final answer
    x = 2,531.72

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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.