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Finding the Fourth Proportional to 6,143.80, 9,215.70 and 5,706.40

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Solution

The fourth proportional to 6,143.80, 9,215.70 and 5,706.40 is: 8,559.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,143.80 : 9,215.70 = 5,706.40 : x
  2. Step 2: Convert to fraction form
    6,143.80/9,215.70 = 5,706.40/x
  3. Step 3: Cross multiply
    6,143.80x = 9,215.70 × 5,706.40
  4. Step 4: Simplify right side
    6,143.80x = 52,588,470.48
  5. Step 5: Solve for x
    x = 52,588,470.48/6,143.80
  6. Step 6: Final answer
    x = 8,559.60

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Double scale
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Similar ratio
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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.