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Finding the Fourth Proportional to 5,187.60, 7,778.88 and 1,724.40

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Solution

The fourth proportional to 5,187.60, 7,778.88 and 1,724.40 is: 2,585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,187.60 : 7,778.88 = 1,724.40 : x
  2. Step 2: Convert to fraction form
    5,187.60/7,778.88 = 1,724.40/x
  3. Step 3: Cross multiply
    5,187.60x = 7,778.88 × 1,724.40
  4. Step 4: Simplify right side
    5,187.60x = 13,413,900.67
  5. Step 5: Solve for x
    x = 13,413,900.67/5,187.60
  6. Step 6: Final answer
    x = 2,585.76

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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.