Home / 81,216.40-121,824.60-28,631.20

Finding the Fourth Proportional to 81,216.40, 121,824.60 and 28,631.20

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Solution

The fourth proportional to 81,216.40, 121,824.60 and 28,631.20 is: 42,946.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,216.40 : 121,824.60 = 28,631.20 : x
  2. Step 2: Convert to fraction form
    81,216.40/121,824.60 = 28,631.20/x
  3. Step 3: Cross multiply
    81,216.40x = 121,824.60 × 28,631.20
  4. Step 4: Simplify right side
    81,216.40x = 3,487,984,487.52
  5. Step 5: Solve for x
    x = 3,487,984,487.52/81,216.40
  6. Step 6: Final answer
    x = 42,946.80

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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.