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Finding the Fourth Proportional to 9,980.80, 14,971.20 and 6,870.40

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Solution

The fourth proportional to 9,980.80, 14,971.20 and 6,870.40 is: 10,305.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,980.80 : 14,971.20 = 6,870.40 : x
  2. Step 2: Convert to fraction form
    9,980.80/14,971.20 = 6,870.40/x
  3. Step 3: Cross multiply
    9,980.80x = 14,971.20 × 6,870.40
  4. Step 4: Simplify right side
    9,980.80x = 102,858,132.48
  5. Step 5: Solve for x
    x = 102,858,132.48/9,980.80
  6. Step 6: Final answer
    x = 10,305.60

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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.