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Finding the Fourth Proportional to 208,172.61, 287,278.92 and 112,679.28

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Solution

The fourth proportional to 208,172.61, 287,278.92 and 112,679.28 is: 155,497.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,172.61 : 287,278.92 = 112,679.28 : x
  2. Step 2: Convert to fraction form
    208,172.61/287,278.92 = 112,679.28/x
  3. Step 3: Cross multiply
    208,172.61x = 287,278.92 × 112,679.28
  4. Step 4: Simplify right side
    208,172.61x = 32,370,381,864.78
  5. Step 5: Solve for x
    x = 32,370,381,864.78/208,172.61
  6. Step 6: Final answer
    x = 155,497.80

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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.