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Finding the Fourth Proportional to 8,779.80, 12,126.18 and 6,400.38

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Solution

The fourth proportional to 8,779.80, 12,126.18 and 6,400.38 is: 8,839.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.80 : 12,126.18 = 6,400.38 : x
  2. Step 2: Convert to fraction form
    8,779.80/12,126.18 = 6,400.38/x
  3. Step 3: Cross multiply
    8,779.80x = 12,126.18 × 6,400.38
  4. Step 4: Simplify right side
    8,779.80x = 77,612,159.95
  5. Step 5: Solve for x
    x = 77,612,159.95/8,779.80
  6. Step 6: Final answer
    x = 8,839.86

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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.