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Finding the Fourth Proportional to 121,142.20, 181,907.70 and 81,873.40

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Solution

The fourth proportional to 121,142.20, 181,907.70 and 81,873.40 is: 122,941.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,142.20 : 181,907.70 = 81,873.40 : x
  2. Step 2: Convert to fraction form
    121,142.20/181,907.70 = 81,873.40/x
  3. Step 3: Cross multiply
    121,142.20x = 181,907.70 × 81,873.40
  4. Step 4: Simplify right side
    121,142.20x = 14,893,401,885.18
  5. Step 5: Solve for x
    x = 14,893,401,885.18/121,142.20
  6. Step 6: Final answer
    x = 122,941.48

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1.5x scale

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.