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Finding the Fourth Proportional to 66,599.80, 91,720.62 and 65,148.28

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Solution

The fourth proportional to 66,599.80, 91,720.62 and 65,148.28 is: 89,721.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,599.80 : 91,720.62 = 65,148.28 : x
  2. Step 2: Convert to fraction form
    66,599.80/91,720.62 = 65,148.28/x
  3. Step 3: Cross multiply
    66,599.80x = 91,720.62 × 65,148.28
  4. Step 4: Simplify right side
    66,599.80x = 5,975,440,633.53
  5. Step 5: Solve for x
    x = 5,975,440,633.53/66,599.80
  6. Step 6: Final answer
    x = 89,721.60

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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.