Home / 12,780.48-17,636.80-7,115.04

Finding the Fourth Proportional to 12,780.48, 17,636.80 and 7,115.04

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Solution

The fourth proportional to 12,780.48, 17,636.80 and 7,115.04 is: 9,818.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.48 : 17,636.80 = 7,115.04 : x
  2. Step 2: Convert to fraction form
    12,780.48/17,636.80 = 7,115.04/x
  3. Step 3: Cross multiply
    12,780.48x = 17,636.80 × 7,115.04
  4. Step 4: Simplify right side
    12,780.48x = 125,486,537.47
  5. Step 5: Solve for x
    x = 125,486,537.47/12,780.48
  6. Step 6: Final answer
    x = 9,818.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.