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Finding the Fourth Proportional to 112,831.65, 155,730.80 and 65,078.51

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Solution

The fourth proportional to 112,831.65, 155,730.80 and 65,078.51 is: 89,821.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,831.65 : 155,730.80 = 65,078.51 : x
  2. Step 2: Convert to fraction form
    112,831.65/155,730.80 = 65,078.51/x
  3. Step 3: Cross multiply
    112,831.65x = 155,730.80 × 65,078.51
  4. Step 4: Simplify right side
    112,831.65x = 10,134,727,809.15
  5. Step 5: Solve for x
    x = 10,134,727,809.15/112,831.65
  6. Step 6: Final answer
    x = 89,821.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.