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Finding the Fourth Proportional to 5,275.91, 7,280.90 and 2,918.20

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Solution

The fourth proportional to 5,275.91, 7,280.90 and 2,918.20 is: 4,027.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,275.91 : 7,280.90 = 2,918.20 : x
  2. Step 2: Convert to fraction form
    5,275.91/7,280.90 = 2,918.20/x
  3. Step 3: Cross multiply
    5,275.91x = 7,280.90 × 2,918.20
  4. Step 4: Simplify right side
    5,275.91x = 21,247,122.38
  5. Step 5: Solve for x
    x = 21,247,122.38/5,275.91
  6. Step 6: Final answer
    x = 4,027.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.