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Finding the Fourth Proportional to 66,658, 91,989.16 and 39,802.86

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Solution

The fourth proportional to 66,658, 91,989.16 and 39,802.86 is: 54,928.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,658 : 91,989.16 = 39,802.86 : x
  2. Step 2: Convert to fraction form
    66,658/91,989.16 = 39,802.86/x
  3. Step 3: Cross multiply
    66,658x = 91,989.16 × 39,802.86
  4. Step 4: Simplify right side
    66,658x = 3,661,431,657.00
  5. Step 5: Solve for x
    x = 3,661,431,657.00/66,658
  6. Step 6: Final answer
    x = 54,928.62

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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.