Home / 81,029.20-121,284.60-74,808.40

Finding the Fourth Proportional to 81,029.20, 121,284.60 and 74,808.40

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Solution

The fourth proportional to 81,029.20, 121,284.60 and 74,808.40 is: 111,973.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,029.20 : 121,284.60 = 74,808.40 : x
  2. Step 2: Convert to fraction form
    81,029.20/121,284.60 = 74,808.40/x
  3. Step 3: Cross multiply
    81,029.20x = 121,284.60 × 74,808.40
  4. Step 4: Simplify right side
    81,029.20x = 9,073,106,870.64
  5. Step 5: Solve for x
    x = 9,073,106,870.64/81,029.20
  6. Step 6: Final answer
    x = 111,973.30

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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.