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Finding the Fourth Proportional to 66,645.42, 91,978.79 and 38,350.50

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Solution

The fourth proportional to 66,645.42, 91,978.79 and 38,350.50 is: 52,928.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,645.42 : 91,978.79 = 38,350.50 : x
  2. Step 2: Convert to fraction form
    66,645.42/91,978.79 = 38,350.50/x
  3. Step 3: Cross multiply
    66,645.42x = 91,978.79 × 38,350.50
  4. Step 4: Simplify right side
    66,645.42x = 3,527,432,394.14
  5. Step 5: Solve for x
    x = 3,527,432,394.14/66,645.42
  6. Step 6: Final answer
    x = 52,928.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.