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Finding the Fourth Proportional to 9,979.10, 14,980.80 and 9,906.20

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Solution

The fourth proportional to 9,979.10, 14,980.80 and 9,906.20 is: 14,871.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,979.10 : 14,980.80 = 9,906.20 : x
  2. Step 2: Convert to fraction form
    9,979.10/14,980.80 = 9,906.20/x
  3. Step 3: Cross multiply
    9,979.10x = 14,980.80 × 9,906.20
  4. Step 4: Simplify right side
    9,979.10x = 148,402,800.96
  5. Step 5: Solve for x
    x = 148,402,800.96/9,979.10
  6. Step 6: Final answer
    x = 14,871.36

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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.