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Finding the Fourth Proportional to 66,445.76, 91,620.65 and 54,308.58

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Solution

The fourth proportional to 66,445.76, 91,620.65 and 54,308.58 is: 74,884.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,445.76 : 91,620.65 = 54,308.58 : x
  2. Step 2: Convert to fraction form
    66,445.76/91,620.65 = 54,308.58/x
  3. Step 3: Cross multiply
    66,445.76x = 91,620.65 × 54,308.58
  4. Step 4: Simplify right side
    66,445.76x = 4,975,787,128.63
  5. Step 5: Solve for x
    x = 4,975,787,128.63/66,445.76
  6. Step 6: Final answer
    x = 74,884.95

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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.