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Finding the Fourth Proportional to 9,979.61, 13,771.68 and 5,503.78

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Solution

The fourth proportional to 9,979.61, 13,771.68 and 5,503.78 is: 7,595.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,979.61 : 13,771.68 = 5,503.78 : x
  2. Step 2: Convert to fraction form
    9,979.61/13,771.68 = 5,503.78/x
  3. Step 3: Cross multiply
    9,979.61x = 13,771.68 × 5,503.78
  4. Step 4: Simplify right side
    9,979.61x = 75,796,228.09
  5. Step 5: Solve for x
    x = 75,796,228.09/9,979.61
  6. Step 6: Final answer
    x = 7,595.11

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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.