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Finding the Fourth Proportional to 10,980.40, 16,470.60 and 10,721.20

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Solution

The fourth proportional to 10,980.40, 16,470.60 and 10,721.20 is: 16,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,980.40 : 16,470.60 = 10,721.20 : x
  2. Step 2: Convert to fraction form
    10,980.40/16,470.60 = 10,721.20/x
  3. Step 3: Cross multiply
    10,980.40x = 16,470.60 × 10,721.20
  4. Step 4: Simplify right side
    10,980.40x = 176,584,596.72
  5. Step 5: Solve for x
    x = 176,584,596.72/10,980.40
  6. Step 6: Final answer
    x = 16,081.80

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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.