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Finding the Fourth Proportional to 78,523.84, 117,785.76 and 31,809.52

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Solution

The fourth proportional to 78,523.84, 117,785.76 and 31,809.52 is: 47,714.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,523.84 : 117,785.76 = 31,809.52 : x
  2. Step 2: Convert to fraction form
    78,523.84/117,785.76 = 31,809.52/x
  3. Step 3: Cross multiply
    78,523.84x = 117,785.76 × 31,809.52
  4. Step 4: Simplify right side
    78,523.84x = 3,746,708,488.44
  5. Step 5: Solve for x
    x = 3,746,708,488.44/78,523.84
  6. Step 6: Final answer
    x = 47,714.28

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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.