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Finding the Fourth Proportional to 81,010.60, 121,515.90 and 51,340.30

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Solution

The fourth proportional to 81,010.60, 121,515.90 and 51,340.30 is: 77,010.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.60 : 121,515.90 = 51,340.30 : x
  2. Step 2: Convert to fraction form
    81,010.60/121,515.90 = 51,340.30/x
  3. Step 3: Cross multiply
    81,010.60x = 121,515.90 × 51,340.30
  4. Step 4: Simplify right side
    81,010.60x = 6,238,662,760.77
  5. Step 5: Solve for x
    x = 6,238,662,760.77/81,010.60
  6. Step 6: Final answer
    x = 77,010.45

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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.