Home / 280,587.12-420,830.06-80,858.40

Finding the Fourth Proportional to 280,587.12, 420,830.06 and 80,858.40

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Solution

The fourth proportional to 280,587.12, 420,830.06 and 80,858.40 is: 121,273.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,587.12 : 420,830.06 = 80,858.40 : x
  2. Step 2: Convert to fraction form
    280,587.12/420,830.06 = 80,858.40/x
  3. Step 3: Cross multiply
    280,587.12x = 420,830.06 × 80,858.40
  4. Step 4: Simplify right side
    280,587.12x = 34,027,644,919.21
  5. Step 5: Solve for x
    x = 34,027,644,919.21/280,587.12
  6. Step 6: Final answer
    x = 121,273.01

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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.