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Finding the Fourth Proportional to 81,019.80, 121,529.70 and 71,178.30

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Solution

The fourth proportional to 81,019.80, 121,529.70 and 71,178.30 is: 106,767.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,019.80 : 121,529.70 = 71,178.30 : x
  2. Step 2: Convert to fraction form
    81,019.80/121,529.70 = 71,178.30/x
  3. Step 3: Cross multiply
    81,019.80x = 121,529.70 × 71,178.30
  4. Step 4: Simplify right side
    81,019.80x = 8,650,277,445.51
  5. Step 5: Solve for x
    x = 8,650,277,445.51/81,019.80
  6. Step 6: Final answer
    x = 106,767.45

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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.