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Finding the Fourth Proportional to 208,470.96, 287,689.20 and 112,980

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Solution

The fourth proportional to 208,470.96, 287,689.20 and 112,980 is: 155,912.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,470.96 : 287,689.20 = 112,980 : x
  2. Step 2: Convert to fraction form
    208,470.96/287,689.20 = 112,980/x
  3. Step 3: Cross multiply
    208,470.96x = 287,689.20 × 112,980
  4. Step 4: Simplify right side
    208,470.96x = 32,503,125,816
  5. Step 5: Solve for x
    x = 32,503,125,816/208,470.96
  6. Step 6: Final answer
    x = 155,912.01

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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.