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Finding the Fourth Proportional to 6,972.40, 9,780.80 and 6,972.40

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Solution

The fourth proportional to 6,972.40, 9,780.80 and 6,972.40 is: 9,780.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,972.40 : 9,780.80 = 6,972.40 : x
  2. Step 2: Convert to fraction form
    6,972.40/9,780.80 = 6,972.40/x
  3. Step 3: Cross multiply
    6,972.40x = 9,780.80 × 6,972.40
  4. Step 4: Simplify right side
    6,972.40x = 68,195,649.92
  5. Step 5: Solve for x
    x = 68,195,649.92/6,972.40
  6. Step 6: Final answer
    x = 9,780.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.