Home / 80,937.90-121,406.85-78,216.30

Finding the Fourth Proportional to 80,937.90, 121,406.85 and 78,216.30

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Solution

The fourth proportional to 80,937.90, 121,406.85 and 78,216.30 is: 117,324.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,937.90 : 121,406.85 = 78,216.30 : x
  2. Step 2: Convert to fraction form
    80,937.90/121,406.85 = 78,216.30/x
  3. Step 3: Cross multiply
    80,937.90x = 121,406.85 × 78,216.30
  4. Step 4: Simplify right side
    80,937.90x = 9,495,994,601.66
  5. Step 5: Solve for x
    x = 9,495,994,601.66/80,937.90
  6. Step 6: Final answer
    x = 117,324.45

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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.