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Finding the Fourth Proportional to 66,138.40, 99,207.60 and 39,894.40

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Solution

The fourth proportional to 66,138.40, 99,207.60 and 39,894.40 is: 59,841.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,138.40 : 99,207.60 = 39,894.40 : x
  2. Step 2: Convert to fraction form
    66,138.40/99,207.60 = 39,894.40/x
  3. Step 3: Cross multiply
    66,138.40x = 99,207.60 × 39,894.40
  4. Step 4: Simplify right side
    66,138.40x = 3,957,827,677.44
  5. Step 5: Solve for x
    x = 3,957,827,677.44/66,138.40
  6. Step 6: Final answer
    x = 59,841.60

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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.