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Finding the Fourth Proportional to 66,495.80, 99,743.70 and 61,830.20

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Solution

The fourth proportional to 66,495.80, 99,743.70 and 61,830.20 is: 92,745.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,495.80 : 99,743.70 = 61,830.20 : x
  2. Step 2: Convert to fraction form
    66,495.80/99,743.70 = 61,830.20/x
  3. Step 3: Cross multiply
    66,495.80x = 99,743.70 × 61,830.20
  4. Step 4: Simplify right side
    66,495.80x = 6,167,172,919.74
  5. Step 5: Solve for x
    x = 6,167,172,919.74/66,495.80
  6. Step 6: Final answer
    x = 92,745.30

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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.