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Finding the Fourth Proportional to 156,989.80, 235,139.10 and 139,479.40

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Solution

The fourth proportional to 156,989.80, 235,139.10 and 139,479.40 is: 208,912.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,989.80 : 235,139.10 = 139,479.40 : x
  2. Step 2: Convert to fraction form
    156,989.80/235,139.10 = 139,479.40/x
  3. Step 3: Cross multiply
    156,989.80x = 235,139.10 × 139,479.40
  4. Step 4: Simplify right side
    156,989.80x = 32,797,060,584.54
  5. Step 5: Solve for x
    x = 32,797,060,584.54/156,989.80
  6. Step 6: Final answer
    x = 208,912.05

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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.