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Finding the Fourth Proportional to 8,780.90, 13,170.90 and 6,320.12

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Solution

The fourth proportional to 8,780.90, 13,170.90 and 6,320.12 is: 9,479.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,780.90 : 13,170.90 = 6,320.12 : x
  2. Step 2: Convert to fraction form
    8,780.90/13,170.90 = 6,320.12/x
  3. Step 3: Cross multiply
    8,780.90x = 13,170.90 × 6,320.12
  4. Step 4: Simplify right side
    8,780.90x = 83,241,668.51
  5. Step 5: Solve for x
    x = 83,241,668.51/8,780.90
  6. Step 6: Final answer
    x = 9,479.86

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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.