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Finding the Fourth Proportional to 81,210.80, 121,931.40 and 50,106.80

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Solution

The fourth proportional to 81,210.80, 121,931.40 and 50,106.80 is: 75,231.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,210.80 : 121,931.40 = 50,106.80 : x
  2. Step 2: Convert to fraction form
    81,210.80/121,931.40 = 50,106.80/x
  3. Step 3: Cross multiply
    81,210.80x = 121,931.40 × 50,106.80
  4. Step 4: Simplify right side
    81,210.80x = 6,109,592,273.52
  5. Step 5: Solve for x
    x = 6,109,592,273.52/81,210.80
  6. Step 6: Final answer
    x = 75,231.28

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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.