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Finding the Fourth Proportional to 121,135.80, 181,703.70 and 79,145.40

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Solution

The fourth proportional to 121,135.80, 181,703.70 and 79,145.40 is: 118,718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,135.80 : 181,703.70 = 79,145.40 : x
  2. Step 2: Convert to fraction form
    121,135.80/181,703.70 = 79,145.40/x
  3. Step 3: Cross multiply
    121,135.80x = 181,703.70 × 79,145.40
  4. Step 4: Simplify right side
    121,135.80x = 14,381,012,017.98
  5. Step 5: Solve for x
    x = 14,381,012,017.98/121,135.80
  6. Step 6: Final answer
    x = 118,718.10

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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.