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Finding the Fourth Proportional to 66,813.94, 92,211 and 38,520.64

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Solution

The fourth proportional to 66,813.94, 92,211 and 38,520.64 is: 53,162.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,813.94 : 92,211 = 38,520.64 : x
  2. Step 2: Convert to fraction form
    66,813.94/92,211 = 38,520.64/x
  3. Step 3: Cross multiply
    66,813.94x = 92,211 × 38,520.64
  4. Step 4: Simplify right side
    66,813.94x = 3,552,026,735.04
  5. Step 5: Solve for x
    x = 3,552,026,735.04/66,813.94
  6. Step 6: Final answer
    x = 53,162.96

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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.