Home / 81,017.40-121,331.70-39,415.80

Finding the Fourth Proportional to 81,017.40, 121,331.70 and 39,415.80

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Solution

The fourth proportional to 81,017.40, 121,331.70 and 39,415.80 is: 59,029.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,017.40 : 121,331.70 = 39,415.80 : x
  2. Step 2: Convert to fraction form
    81,017.40/121,331.70 = 39,415.80/x
  3. Step 3: Cross multiply
    81,017.40x = 121,331.70 × 39,415.80
  4. Step 4: Simplify right side
    81,017.40x = 4,782,386,020.86
  5. Step 5: Solve for x
    x = 4,782,386,020.86/81,017.40
  6. Step 6: Final answer
    x = 59,029.12

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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.