Home / 85,378.20-128,082.15-35,430.90

Finding the Fourth Proportional to 85,378.20, 128,082.15 and 35,430.90

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Solution

The fourth proportional to 85,378.20, 128,082.15 and 35,430.90 is: 53,152.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,378.20 : 128,082.15 = 35,430.90 : x
  2. Step 2: Convert to fraction form
    85,378.20/128,082.15 = 35,430.90/x
  3. Step 3: Cross multiply
    85,378.20x = 128,082.15 × 35,430.90
  4. Step 4: Simplify right side
    85,378.20x = 4,538,065,848.44
  5. Step 5: Solve for x
    x = 4,538,065,848.44/85,378.20
  6. Step 6: Final answer
    x = 53,152.51

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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.