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Finding the Fourth Proportional to 61,129.20, 85,639.20 and 61,129.20

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Solution

The fourth proportional to 61,129.20, 85,639.20 and 61,129.20 is: 85,639.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,129.20 : 85,639.20 = 61,129.20 : x
  2. Step 2: Convert to fraction form
    61,129.20/85,639.20 = 61,129.20/x
  3. Step 3: Cross multiply
    61,129.20x = 85,639.20 × 61,129.20
  4. Step 4: Simplify right side
    61,129.20x = 5,235,055,784.64
  5. Step 5: Solve for x
    x = 5,235,055,784.64/61,129.20
  6. Step 6: Final answer
    x = 85,639.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.