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Finding the Fourth Proportional to 82,886.70, 124,330.05 and 20,557.20

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Solution

The fourth proportional to 82,886.70, 124,330.05 and 20,557.20 is: 30,835.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,886.70 : 124,330.05 = 20,557.20 : x
  2. Step 2: Convert to fraction form
    82,886.70/124,330.05 = 20,557.20/x
  3. Step 3: Cross multiply
    82,886.70x = 124,330.05 × 20,557.20
  4. Step 4: Simplify right side
    82,886.70x = 2,555,877,703.86
  5. Step 5: Solve for x
    x = 2,555,877,703.86/82,886.70
  6. Step 6: Final answer
    x = 30,835.80

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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.