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Finding the Fourth Proportional to 66,689.86, 92,021.79 and 38,390.08

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Solution

The fourth proportional to 66,689.86, 92,021.79 and 38,390.08 is: 52,972.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,689.86 : 92,021.79 = 38,390.08 : x
  2. Step 2: Convert to fraction form
    66,689.86/92,021.79 = 38,390.08/x
  3. Step 3: Cross multiply
    66,689.86x = 92,021.79 × 38,390.08
  4. Step 4: Simplify right side
    66,689.86x = 3,532,723,879.84
  5. Step 5: Solve for x
    x = 3,532,723,879.84/66,689.86
  6. Step 6: Final answer
    x = 52,972.43

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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.