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Finding the Fourth Proportional to 70,511.40, 105,767.10 and 42,517.80

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Solution

The fourth proportional to 70,511.40, 105,767.10 and 42,517.80 is: 63,776.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,511.40 : 105,767.10 = 42,517.80 : x
  2. Step 2: Convert to fraction form
    70,511.40/105,767.10 = 42,517.80/x
  3. Step 3: Cross multiply
    70,511.40x = 105,767.10 × 42,517.80
  4. Step 4: Simplify right side
    70,511.40x = 4,496,984,404.38
  5. Step 5: Solve for x
    x = 4,496,984,404.38/70,511.40
  6. Step 6: Final answer
    x = 63,776.70

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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.