Home / 21,885.60-30,159.36-20,408.16

Finding the Fourth Proportional to 21,885.60, 30,159.36 and 20,408.16

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Solution

The fourth proportional to 21,885.60, 30,159.36 and 20,408.16 is: 28,123.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,885.60 : 30,159.36 = 20,408.16 : x
  2. Step 2: Convert to fraction form
    21,885.60/30,159.36 = 20,408.16/x
  3. Step 3: Cross multiply
    21,885.60x = 30,159.36 × 20,408.16
  4. Step 4: Simplify right side
    21,885.60x = 615,497,044.38
  5. Step 5: Solve for x
    x = 615,497,044.38/21,885.60
  6. Step 6: Final answer
    x = 28,123.38

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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.