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Finding the Fourth Proportional to 70,127.80, 105,191.70 and 42,479.80

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Solution

The fourth proportional to 70,127.80, 105,191.70 and 42,479.80 is: 63,719.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,127.80 : 105,191.70 = 42,479.80 : x
  2. Step 2: Convert to fraction form
    70,127.80/105,191.70 = 42,479.80/x
  3. Step 3: Cross multiply
    70,127.80x = 105,191.70 × 42,479.80
  4. Step 4: Simplify right side
    70,127.80x = 4,468,522,377.66
  5. Step 5: Solve for x
    x = 4,468,522,377.66/70,127.80
  6. Step 6: Final answer
    x = 63,719.70

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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.