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Finding the Fourth Proportional to 78,787.36, 108,722.28 and 45,253.36

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Solution

The fourth proportional to 78,787.36, 108,722.28 and 45,253.36 is: 62,447.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,787.36 : 108,722.28 = 45,253.36 : x
  2. Step 2: Convert to fraction form
    78,787.36/108,722.28 = 45,253.36/x
  3. Step 3: Cross multiply
    78,787.36x = 108,722.28 × 45,253.36
  4. Step 4: Simplify right side
    78,787.36x = 4,920,048,476.86
  5. Step 5: Solve for x
    x = 4,920,048,476.86/78,787.36
  6. Step 6: Final answer
    x = 62,447.18

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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.