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Finding the Fourth Proportional to 79,980.81, 120,045.02 and 40,565.60

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Solution

The fourth proportional to 79,980.81, 120,045.02 and 40,565.60 is: 60,885.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,980.81 : 120,045.02 = 40,565.60 : x
  2. Step 2: Convert to fraction form
    79,980.81/120,045.02 = 40,565.60/x
  3. Step 3: Cross multiply
    79,980.81x = 120,045.02 × 40,565.60
  4. Step 4: Simplify right side
    79,980.81x = 4,869,698,360.60
  5. Step 5: Solve for x
    x = 4,869,698,360.60/79,980.81
  6. Step 6: Final answer
    x = 60,885.83

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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.