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Finding the Fourth Proportional to 74,700.90, 111,978.45 and 66,827.70

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Solution

The fourth proportional to 74,700.90, 111,978.45 and 66,827.70 is: 100,176.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,700.90 : 111,978.45 = 66,827.70 : x
  2. Step 2: Convert to fraction form
    74,700.90/111,978.45 = 66,827.70/x
  3. Step 3: Cross multiply
    74,700.90x = 111,978.45 × 66,827.70
  4. Step 4: Simplify right side
    74,700.90x = 7,483,262,263.07
  5. Step 5: Solve for x
    x = 7,483,262,263.07/74,700.90
  6. Step 6: Final answer
    x = 100,176.33

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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.