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Finding the Fourth Proportional to 318,079.40, 477,118.80 and 81,421.70

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Solution

The fourth proportional to 318,079.40, 477,118.80 and 81,421.70 is: 122,132.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,079.40 : 477,118.80 = 81,421.70 : x
  2. Step 2: Convert to fraction form
    318,079.40/477,118.80 = 81,421.70/x
  3. Step 3: Cross multiply
    318,079.40x = 477,118.80 × 81,421.70
  4. Step 4: Simplify right side
    318,079.40x = 38,847,823,797.96
  5. Step 5: Solve for x
    x = 38,847,823,797.96/318,079.40
  6. Step 6: Final answer
    x = 122,132.47

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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.