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Finding the Fourth Proportional to 9,990.40, 14,978.40 and 5,609.20

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Solution

The fourth proportional to 9,990.40, 14,978.40 and 5,609.20 is: 8,409.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.40 : 14,978.40 = 5,609.20 : x
  2. Step 2: Convert to fraction form
    9,990.40/14,978.40 = 5,609.20/x
  3. Step 3: Cross multiply
    9,990.40x = 14,978.40 × 5,609.20
  4. Step 4: Simplify right side
    9,990.40x = 84,016,841.28
  5. Step 5: Solve for x
    x = 84,016,841.28/9,990.40
  6. Step 6: Final answer
    x = 8,409.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.