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Finding the Fourth Proportional to 121,411.70, 182,117.55 and 91,887.20

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Solution

The fourth proportional to 121,411.70, 182,117.55 and 91,887.20 is: 137,830.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,411.70 : 182,117.55 = 91,887.20 : x
  2. Step 2: Convert to fraction form
    121,411.70/182,117.55 = 91,887.20/x
  3. Step 3: Cross multiply
    121,411.70x = 182,117.55 × 91,887.20
  4. Step 4: Simplify right side
    121,411.70x = 16,734,271,740.36
  5. Step 5: Solve for x
    x = 16,734,271,740.36/121,411.70
  6. Step 6: Final answer
    x = 137,830.80

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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.