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Finding the Fourth Proportional to 40,801.40, 61,211.60 and 12,720

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Solution

The fourth proportional to 40,801.40, 61,211.60 and 12,720 is: 19,082.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,801.40 : 61,211.60 = 12,720 : x
  2. Step 2: Convert to fraction form
    40,801.40/61,211.60 = 12,720/x
  3. Step 3: Cross multiply
    40,801.40x = 61,211.60 × 12,720
  4. Step 4: Simplify right side
    40,801.40x = 778,611,552
  5. Step 5: Solve for x
    x = 778,611,552/40,801.40
  6. Step 6: Final answer
    x = 19,082.96

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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.