Home / 9,899.88-13,661.28-5,422.78

Finding the Fourth Proportional to 9,899.88, 13,661.28 and 5,422.78

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Solution

The fourth proportional to 9,899.88, 13,661.28 and 5,422.78 is: 7,483.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,899.88 : 13,661.28 = 5,422.78 : x
  2. Step 2: Convert to fraction form
    9,899.88/13,661.28 = 5,422.78/x
  3. Step 3: Cross multiply
    9,899.88x = 13,661.28 × 5,422.78
  4. Step 4: Simplify right side
    9,899.88x = 74,082,115.96
  5. Step 5: Solve for x
    x = 74,082,115.96/9,899.88
  6. Step 6: Final answer
    x = 7,483.13

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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.