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Finding the Fourth Proportional to 123,566.64, 170,521.80 and 66,978

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Solution

The fourth proportional to 123,566.64, 170,521.80 and 66,978 is: 92,429.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,566.64 : 170,521.80 = 66,978 : x
  2. Step 2: Convert to fraction form
    123,566.64/170,521.80 = 66,978/x
  3. Step 3: Cross multiply
    123,566.64x = 170,521.80 × 66,978
  4. Step 4: Simplify right side
    123,566.64x = 11,421,209,120.40
  5. Step 5: Solve for x
    x = 11,421,209,120.40/123,566.64
  6. Step 6: Final answer
    x = 92,429.55

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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.