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Finding the Fourth Proportional to 9,899.10, 13,660.80 and 5,422.89

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Solution

The fourth proportional to 9,899.10, 13,660.80 and 5,422.89 is: 7,483.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,899.10 : 13,660.80 = 5,422.89 : x
  2. Step 2: Convert to fraction form
    9,899.10/13,660.80 = 5,422.89/x
  3. Step 3: Cross multiply
    9,899.10x = 13,660.80 × 5,422.89
  4. Step 4: Simplify right side
    9,899.10x = 74,081,015.71
  5. Step 5: Solve for x
    x = 74,081,015.71/9,899.10
  6. Step 6: Final answer
    x = 7,483.61

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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.