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Finding the Fourth Proportional to 70,718.47, 105,981.11 and 39,081.69

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Solution

The fourth proportional to 70,718.47, 105,981.11 and 39,081.69 is: 58,569.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,718.47 : 105,981.11 = 39,081.69 : x
  2. Step 2: Convert to fraction form
    70,718.47/105,981.11 = 39,081.69/x
  3. Step 3: Cross multiply
    70,718.47x = 105,981.11 × 39,081.69
  4. Step 4: Simplify right side
    70,718.47x = 4,141,920,838.02
  5. Step 5: Solve for x
    x = 4,141,920,838.02/70,718.47
  6. Step 6: Final answer
    x = 58,569.15

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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.