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Finding the Fourth Proportional to 82,938.60, 124,407.90 and 20,609.10

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Solution

The fourth proportional to 82,938.60, 124,407.90 and 20,609.10 is: 30,913.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,938.60 : 124,407.90 = 20,609.10 : x
  2. Step 2: Convert to fraction form
    82,938.60/124,407.90 = 20,609.10/x
  3. Step 3: Cross multiply
    82,938.60x = 124,407.90 × 20,609.10
  4. Step 4: Simplify right side
    82,938.60x = 2,563,934,851.89
  5. Step 5: Solve for x
    x = 2,563,934,851.89/82,938.60
  6. Step 6: Final answer
    x = 30,913.65

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Similar ratio
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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.