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Finding the Fourth Proportional to 25,640.90, 38,461.34 and 20,479.58

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Solution

The fourth proportional to 25,640.90, 38,461.34 and 20,479.58 is: 30,719.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,640.90 : 38,461.34 = 20,479.58 : x
  2. Step 2: Convert to fraction form
    25,640.90/38,461.34 = 20,479.58/x
  3. Step 3: Cross multiply
    25,640.90x = 38,461.34 × 20,479.58
  4. Step 4: Simplify right side
    25,640.90x = 787,671,948.33
  5. Step 5: Solve for x
    x = 787,671,948.33/25,640.90
  6. Step 6: Final answer
    x = 30,719.36

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1.5x scale

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.