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Finding the Fourth Proportional to 40,921.70, 61,421.70 and 21,214.40

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Solution

The fourth proportional to 40,921.70, 61,421.70 and 21,214.40 is: 31,841.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,921.70 : 61,421.70 = 21,214.40 : x
  2. Step 2: Convert to fraction form
    40,921.70/61,421.70 = 21,214.40/x
  3. Step 3: Cross multiply
    40,921.70x = 61,421.70 × 21,214.40
  4. Step 4: Simplify right side
    40,921.70x = 1,303,024,512.48
  5. Step 5: Solve for x
    x = 1,303,024,512.48/40,921.70
  6. Step 6: Final answer
    x = 31,841.90

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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.