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Finding the Fourth Proportional to 5,147.70, 7,718.85 and 1,860.30

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Solution

The fourth proportional to 5,147.70, 7,718.85 and 1,860.30 is: 2,789.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,147.70 : 7,718.85 = 1,860.30 : x
  2. Step 2: Convert to fraction form
    5,147.70/7,718.85 = 1,860.30/x
  3. Step 3: Cross multiply
    5,147.70x = 7,718.85 × 1,860.30
  4. Step 4: Simplify right side
    5,147.70x = 14,359,376.66
  5. Step 5: Solve for x
    x = 14,359,376.66/5,147.70
  6. Step 6: Final answer
    x = 2,789.47

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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.