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Finding the Fourth Proportional to 7,320.80, 10,981.20 and 6,898.40

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Solution

The fourth proportional to 7,320.80, 10,981.20 and 6,898.40 is: 10,347.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320.80 : 10,981.20 = 6,898.40 : x
  2. Step 2: Convert to fraction form
    7,320.80/10,981.20 = 6,898.40/x
  3. Step 3: Cross multiply
    7,320.80x = 10,981.20 × 6,898.40
  4. Step 4: Simplify right side
    7,320.80x = 75,752,710.08
  5. Step 5: Solve for x
    x = 75,752,710.08/7,320.80
  6. Step 6: Final answer
    x = 10,347.60

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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.