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Finding the Fourth Proportional to 861,137.80, 1,291,706.70 and 221,440.30

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Solution

The fourth proportional to 861,137.80, 1,291,706.70 and 221,440.30 is: 332,160.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,137.80 : 1,291,706.70 = 221,440.30 : x
  2. Step 2: Convert to fraction form
    861,137.80/1,291,706.70 = 221,440.30/x
  3. Step 3: Cross multiply
    861,137.80x = 1,291,706.70 × 221,440.30
  4. Step 4: Simplify right side
    861,137.80x = 286,035,919,160.01
  5. Step 5: Solve for x
    x = 286,035,919,160.01/861,137.80
  6. Step 6: Final answer
    x = 332,160.45

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Double scale
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Similar ratio
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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.