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Finding the Fourth Proportional to 112,710.20, 155,540.40 and 61,723.40

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Solution

The fourth proportional to 112,710.20, 155,540.40 and 61,723.40 is: 85,178.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,710.20 : 155,540.40 = 61,723.40 : x
  2. Step 2: Convert to fraction form
    112,710.20/155,540.40 = 61,723.40/x
  3. Step 3: Cross multiply
    112,710.20x = 155,540.40 × 61,723.40
  4. Step 4: Simplify right side
    112,710.20x = 9,600,482,325.36
  5. Step 5: Solve for x
    x = 9,600,482,325.36/112,710.20
  6. Step 6: Final answer
    x = 85,178.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.