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Finding the Fourth Proportional to 7,158.78, 9,879.57 and 4,015.17

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Solution

The fourth proportional to 7,158.78, 9,879.57 and 4,015.17 is: 5,541.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,158.78 : 9,879.57 = 4,015.17 : x
  2. Step 2: Convert to fraction form
    7,158.78/9,879.57 = 4,015.17/x
  3. Step 3: Cross multiply
    7,158.78x = 9,879.57 × 4,015.17
  4. Step 4: Simplify right side
    7,158.78x = 39,668,153.08
  5. Step 5: Solve for x
    x = 39,668,153.08/7,158.78
  6. Step 6: Final answer
    x = 5,541.19

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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.