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Finding the Fourth Proportional to 208,061.80, 312,092.70 and 128,163.40

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Solution

The fourth proportional to 208,061.80, 312,092.70 and 128,163.40 is: 192,245.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,061.80 : 312,092.70 = 128,163.40 : x
  2. Step 2: Convert to fraction form
    208,061.80/312,092.70 = 128,163.40/x
  3. Step 3: Cross multiply
    208,061.80x = 312,092.70 × 128,163.40
  4. Step 4: Simplify right side
    208,061.80x = 39,998,861,547.18
  5. Step 5: Solve for x
    x = 39,998,861,547.18/208,061.80
  6. Step 6: Final answer
    x = 192,245.10

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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.