Home / 9,780.39-13,488.26-7,680.87

Finding the Fourth Proportional to 9,780.39, 13,488.26 and 7,680.87

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Solution

The fourth proportional to 9,780.39, 13,488.26 and 7,680.87 is: 10,592.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,780.39 : 13,488.26 = 7,680.87 : x
  2. Step 2: Convert to fraction form
    9,780.39/13,488.26 = 7,680.87/x
  3. Step 3: Cross multiply
    9,780.39x = 13,488.26 × 7,680.87
  4. Step 4: Simplify right side
    9,780.39x = 103,601,533.18
  5. Step 5: Solve for x
    x = 103,601,533.18/9,780.39
  6. Step 6: Final answer
    x = 10,592.78

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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.