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Finding the Fourth Proportional to 123,307.76, 170,164.80 and 66,719.20

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Solution

The fourth proportional to 123,307.76, 170,164.80 and 66,719.20 is: 92,072.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,307.76 : 170,164.80 = 66,719.20 : x
  2. Step 2: Convert to fraction form
    123,307.76/170,164.80 = 66,719.20/x
  3. Step 3: Cross multiply
    123,307.76x = 170,164.80 × 66,719.20
  4. Step 4: Simplify right side
    123,307.76x = 11,353,259,324.16
  5. Step 5: Solve for x
    x = 11,353,259,324.16/123,307.76
  6. Step 6: Final answer
    x = 92,072.55

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1.5x scale

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.