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Finding the Fourth Proportional to 70,479.48, 105,685.74 and 40,906.38

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Solution

The fourth proportional to 70,479.48, 105,685.74 and 40,906.38 is: 61,340.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,479.48 : 105,685.74 = 40,906.38 : x
  2. Step 2: Convert to fraction form
    70,479.48/105,685.74 = 40,906.38/x
  3. Step 3: Cross multiply
    70,479.48x = 105,685.74 × 40,906.38
  4. Step 4: Simplify right side
    70,479.48x = 4,323,221,041.02
  5. Step 5: Solve for x
    x = 4,323,221,041.02/70,479.48
  6. Step 6: Final answer
    x = 61,340.14

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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.