Home / 81,005.58-121,508.19-28,430.10

Finding the Fourth Proportional to 81,005.58, 121,508.19 and 28,430.10

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Solution

The fourth proportional to 81,005.58, 121,508.19 and 28,430.10 is: 42,645.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,005.58 : 121,508.19 = 28,430.10 : x
  2. Step 2: Convert to fraction form
    81,005.58/121,508.19 = 28,430.10/x
  3. Step 3: Cross multiply
    81,005.58x = 121,508.19 × 28,430.10
  4. Step 4: Simplify right side
    81,005.58x = 3,454,489,992.52
  5. Step 5: Solve for x
    x = 3,454,489,992.52/81,005.58
  6. Step 6: Final answer
    x = 42,645.09

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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.