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Finding the Fourth Proportional to 121,019.80, 181,529.70 and 112,271.80

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Solution

The fourth proportional to 121,019.80, 181,529.70 and 112,271.80 is: 168,407.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,019.80 : 181,529.70 = 112,271.80 : x
  2. Step 2: Convert to fraction form
    121,019.80/181,529.70 = 112,271.80/x
  3. Step 3: Cross multiply
    121,019.80x = 181,529.70 × 112,271.80
  4. Step 4: Simplify right side
    121,019.80x = 20,380,666,172.46
  5. Step 5: Solve for x
    x = 20,380,666,172.46/121,019.80
  6. Step 6: Final answer
    x = 168,407.70

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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.