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Finding the Fourth Proportional to 9,989.60, 14,984.40 and 6,879.20

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Solution

The fourth proportional to 9,989.60, 14,984.40 and 6,879.20 is: 10,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.60 : 14,984.40 = 6,879.20 : x
  2. Step 2: Convert to fraction form
    9,989.60/14,984.40 = 6,879.20/x
  3. Step 3: Cross multiply
    9,989.60x = 14,984.40 × 6,879.20
  4. Step 4: Simplify right side
    9,989.60x = 103,080,684.48
  5. Step 5: Solve for x
    x = 103,080,684.48/9,989.60
  6. Step 6: Final answer
    x = 10,318.80

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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.