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Finding the Fourth Proportional to 208,121.98, 287,209.22 and 112,628.68

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Solution

The fourth proportional to 208,121.98, 287,209.22 and 112,628.68 is: 155,428.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,121.98 : 287,209.22 = 112,628.68 : x
  2. Step 2: Convert to fraction form
    208,121.98/287,209.22 = 112,628.68/x
  3. Step 3: Cross multiply
    208,121.98x = 287,209.22 × 112,628.68
  4. Step 4: Simplify right side
    208,121.98x = 32,347,995,332.43
  5. Step 5: Solve for x
    x = 32,347,995,332.43/208,121.98
  6. Step 6: Final answer
    x = 155,428.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.