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Finding the Fourth Proportional to 66,880.80, 99,731.73 and 66,281.22

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Solution

The fourth proportional to 66,880.80, 99,731.73 and 66,281.22 is: 98,837.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,880.80 : 99,731.73 = 66,281.22 : x
  2. Step 2: Convert to fraction form
    66,880.80/99,731.73 = 66,281.22/x
  3. Step 3: Cross multiply
    66,880.80x = 99,731.73 × 66,281.22
  4. Step 4: Simplify right side
    66,880.80x = 6,610,340,737.11
  5. Step 5: Solve for x
    x = 6,610,340,737.11/66,880.80
  6. Step 6: Final answer
    x = 98,837.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.