Home / 81,015.90-121,523.85-28,430.70

Finding the Fourth Proportional to 81,015.90, 121,523.85 and 28,430.70

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Solution

The fourth proportional to 81,015.90, 121,523.85 and 28,430.70 is: 42,646.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,015.90 : 121,523.85 = 28,430.70 : x
  2. Step 2: Convert to fraction form
    81,015.90/121,523.85 = 28,430.70/x
  3. Step 3: Cross multiply
    81,015.90x = 121,523.85 × 28,430.70
  4. Step 4: Simplify right side
    81,015.90x = 3,455,008,122.20
  5. Step 5: Solve for x
    x = 3,455,008,122.20/81,015.90
  6. Step 6: Final answer
    x = 42,646.05

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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.