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Finding the Fourth Proportional to 122,543.40, 183,815.10 and 91,439.40

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Solution

The fourth proportional to 122,543.40, 183,815.10 and 91,439.40 is: 137,159.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,543.40 : 183,815.10 = 91,439.40 : x
  2. Step 2: Convert to fraction form
    122,543.40/183,815.10 = 91,439.40/x
  3. Step 3: Cross multiply
    122,543.40x = 183,815.10 × 91,439.40
  4. Step 4: Simplify right side
    122,543.40x = 16,807,942,454.94
  5. Step 5: Solve for x
    x = 16,807,942,454.94/122,543.40
  6. Step 6: Final answer
    x = 137,159.10

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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.