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Finding the Fourth Proportional to 66,642.47, 91,907.05 and 55,293.99

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Solution

The fourth proportional to 66,642.47, 91,907.05 and 55,293.99 is: 76,256.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,642.47 : 91,907.05 = 55,293.99 : x
  2. Step 2: Convert to fraction form
    66,642.47/91,907.05 = 55,293.99/x
  3. Step 3: Cross multiply
    66,642.47x = 91,907.05 × 55,293.99
  4. Step 4: Simplify right side
    66,642.47x = 5,081,907,572.75
  5. Step 5: Solve for x
    x = 5,081,907,572.75/66,642.47
  6. Step 6: Final answer
    x = 76,256.30

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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.