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Finding the Fourth Proportional to 139,803.12, 209,703.67 and 83,658.78

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Solution

The fourth proportional to 139,803.12, 209,703.67 and 83,658.78 is: 125,487.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,803.12 : 209,703.67 = 83,658.78 : x
  2. Step 2: Convert to fraction form
    139,803.12/209,703.67 = 83,658.78/x
  3. Step 3: Cross multiply
    139,803.12x = 209,703.67 × 83,658.78
  4. Step 4: Simplify right side
    139,803.12x = 17,543,552,984.58
  5. Step 5: Solve for x
    x = 17,543,552,984.58/139,803.12
  6. Step 6: Final answer
    x = 125,487.56

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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.