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Finding the Fourth Proportional to 103,691.40, 155,537.10 and 70,513.80

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Solution

The fourth proportional to 103,691.40, 155,537.10 and 70,513.80 is: 105,770.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,691.40 : 155,537.10 = 70,513.80 : x
  2. Step 2: Convert to fraction form
    103,691.40/155,537.10 = 70,513.80/x
  3. Step 3: Cross multiply
    103,691.40x = 155,537.10 × 70,513.80
  4. Step 4: Simplify right side
    103,691.40x = 10,967,511,961.98
  5. Step 5: Solve for x
    x = 10,967,511,961.98/103,691.40
  6. Step 6: Final answer
    x = 105,770.70

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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.