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Finding the Fourth Proportional to 8,077.80, 12,116.70 and 5,147.40

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Solution

The fourth proportional to 8,077.80, 12,116.70 and 5,147.40 is: 7,721.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,077.80 : 12,116.70 = 5,147.40 : x
  2. Step 2: Convert to fraction form
    8,077.80/12,116.70 = 5,147.40/x
  3. Step 3: Cross multiply
    8,077.80x = 12,116.70 × 5,147.40
  4. Step 4: Simplify right side
    8,077.80x = 62,369,501.58
  5. Step 5: Solve for x
    x = 62,369,501.58/8,077.80
  6. Step 6: Final answer
    x = 7,721.10

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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.