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Finding the Fourth Proportional to 7,158.76, 9,879.63 and 3,972.66

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Solution

The fourth proportional to 7,158.76, 9,879.63 and 3,972.66 is: 5,482.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,158.76 : 9,879.63 = 3,972.66 : x
  2. Step 2: Convert to fraction form
    7,158.76/9,879.63 = 3,972.66/x
  3. Step 3: Cross multiply
    7,158.76x = 9,879.63 × 3,972.66
  4. Step 4: Simplify right side
    7,158.76x = 39,248,432.06
  5. Step 5: Solve for x
    x = 39,248,432.06/7,158.76
  6. Step 6: Final answer
    x = 5,482.57

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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.