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Finding the Fourth Proportional to 66,405.72, 91,729.64 and 53,070.44

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Solution

The fourth proportional to 66,405.72, 91,729.64 and 53,070.44 is: 73,308.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,405.72 : 91,729.64 = 53,070.44 : x
  2. Step 2: Convert to fraction form
    66,405.72/91,729.64 = 53,070.44/x
  3. Step 3: Cross multiply
    66,405.72x = 91,729.64 × 53,070.44
  4. Step 4: Simplify right side
    66,405.72x = 4,868,132,355.84
  5. Step 5: Solve for x
    x = 4,868,132,355.84/66,405.72
  6. Step 6: Final answer
    x = 73,308.93

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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.