Home / 81,320.20-121,980.30-57,700.60

Finding the Fourth Proportional to 81,320.20, 121,980.30 and 57,700.60

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Solution

The fourth proportional to 81,320.20, 121,980.30 and 57,700.60 is: 86,550.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,320.20 : 121,980.30 = 57,700.60 : x
  2. Step 2: Convert to fraction form
    81,320.20/121,980.30 = 57,700.60/x
  3. Step 3: Cross multiply
    81,320.20x = 121,980.30 × 57,700.60
  4. Step 4: Simplify right side
    81,320.20x = 7,038,336,498.18
  5. Step 5: Solve for x
    x = 7,038,336,498.18/81,320.20
  6. Step 6: Final answer
    x = 86,550.90

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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.