Home / 81,210.40-121,815.60-28,625.20

Finding the Fourth Proportional to 81,210.40, 121,815.60 and 28,625.20

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Solution

The fourth proportional to 81,210.40, 121,815.60 and 28,625.20 is: 42,937.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,210.40 : 121,815.60 = 28,625.20 : x
  2. Step 2: Convert to fraction form
    81,210.40/121,815.60 = 28,625.20/x
  3. Step 3: Cross multiply
    81,210.40x = 121,815.60 × 28,625.20
  4. Step 4: Simplify right side
    81,210.40x = 3,486,995,913.12
  5. Step 5: Solve for x
    x = 3,486,995,913.12/81,210.40
  6. Step 6: Final answer
    x = 42,937.80

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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.