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Finding the Fourth Proportional to 235,785.48, 353,643.12 and 85,990.56

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Solution

The fourth proportional to 235,785.48, 353,643.12 and 85,990.56 is: 128,973.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,785.48 : 353,643.12 = 85,990.56 : x
  2. Step 2: Convert to fraction form
    235,785.48/353,643.12 = 85,990.56/x
  3. Step 3: Cross multiply
    235,785.48x = 353,643.12 × 85,990.56
  4. Step 4: Simplify right side
    235,785.48x = 30,409,969,928.95
  5. Step 5: Solve for x
    x = 30,409,969,928.95/235,785.48
  6. Step 6: Final answer
    x = 128,973.04

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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.