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Finding the Fourth Proportional to 70,724.49, 105,990.12 and 39,087.69

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Solution

The fourth proportional to 70,724.49, 105,990.12 and 39,087.69 is: 58,578.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,724.49 : 105,990.12 = 39,087.69 : x
  2. Step 2: Convert to fraction form
    70,724.49/105,990.12 = 39,087.69/x
  3. Step 3: Cross multiply
    70,724.49x = 105,990.12 × 39,087.69
  4. Step 4: Simplify right side
    70,724.49x = 4,142,908,953.62
  5. Step 5: Solve for x
    x = 4,142,908,953.62/70,724.49
  6. Step 6: Final answer
    x = 58,578.14

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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.