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Finding the Fourth Proportional to 66,999.78, 100,368.27 and 38,860.70

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Solution

The fourth proportional to 66,999.78, 100,368.27 and 38,860.70 is: 58,214.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,999.78 : 100,368.27 = 38,860.70 : x
  2. Step 2: Convert to fraction form
    66,999.78/100,368.27 = 38,860.70/x
  3. Step 3: Cross multiply
    66,999.78x = 100,368.27 × 38,860.70
  4. Step 4: Simplify right side
    66,999.78x = 3,900,381,229.99
  5. Step 5: Solve for x
    x = 3,900,381,229.99/66,999.78
  6. Step 6: Final answer
    x = 58,214.84

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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.