Home / 85,420.20-128,145.15-35,472.90

Finding the Fourth Proportional to 85,420.20, 128,145.15 and 35,472.90

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Solution

The fourth proportional to 85,420.20, 128,145.15 and 35,472.90 is: 53,215.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,420.20 : 128,145.15 = 35,472.90 : x
  2. Step 2: Convert to fraction form
    85,420.20/128,145.15 = 35,472.90/x
  3. Step 3: Cross multiply
    85,420.20x = 128,145.15 × 35,472.90
  4. Step 4: Simplify right side
    85,420.20x = 4,545,680,091.44
  5. Step 5: Solve for x
    x = 4,545,680,091.44/85,420.20
  6. Step 6: Final answer
    x = 53,215.52

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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.