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Finding the Fourth Proportional to 71,479.78, 98,641.38 and 39,648.58

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Solution

The fourth proportional to 71,479.78, 98,641.38 and 39,648.58 is: 54,714.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,479.78 : 98,641.38 = 39,648.58 : x
  2. Step 2: Convert to fraction form
    71,479.78/98,641.38 = 39,648.58/x
  3. Step 3: Cross multiply
    71,479.78x = 98,641.38 × 39,648.58
  4. Step 4: Simplify right side
    71,479.78x = 3,910,990,646.24
  5. Step 5: Solve for x
    x = 3,910,990,646.24/71,479.78
  6. Step 6: Final answer
    x = 54,714.64

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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.