Home / 81,015.40-121,523.10-28,430.20

Finding the Fourth Proportional to 81,015.40, 121,523.10 and 28,430.20

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Solution

The fourth proportional to 81,015.40, 121,523.10 and 28,430.20 is: 42,645.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,015.40 : 121,523.10 = 28,430.20 : x
  2. Step 2: Convert to fraction form
    81,015.40/121,523.10 = 28,430.20/x
  3. Step 3: Cross multiply
    81,015.40x = 121,523.10 × 28,430.20
  4. Step 4: Simplify right side
    81,015.40x = 3,454,926,037.62
  5. Step 5: Solve for x
    x = 3,454,926,037.62/81,015.40
  6. Step 6: Final answer
    x = 42,645.30

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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.