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Finding the Fourth Proportional to 7,191.89, 9,901.19 and 6,490.68

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Solution

The fourth proportional to 7,191.89, 9,901.19 and 6,490.68 is: 8,935.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,191.89 : 9,901.19 = 6,490.68 : x
  2. Step 2: Convert to fraction form
    7,191.89/9,901.19 = 6,490.68/x
  3. Step 3: Cross multiply
    7,191.89x = 9,901.19 × 6,490.68
  4. Step 4: Simplify right side
    7,191.89x = 64,265,454.19
  5. Step 5: Solve for x
    x = 64,265,454.19/7,191.89
  6. Step 6: Final answer
    x = 8,935.82

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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.