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Finding the Fourth Proportional to 123,509.54, 170,443.21 and 66,920.92

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Solution

The fourth proportional to 123,509.54, 170,443.21 and 66,920.92 is: 92,350.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,509.54 : 170,443.21 = 66,920.92 : x
  2. Step 2: Convert to fraction form
    123,509.54/170,443.21 = 66,920.92/x
  3. Step 3: Cross multiply
    123,509.54x = 170,443.21 × 66,920.92
  4. Step 4: Simplify right side
    123,509.54x = 11,406,216,420.95
  5. Step 5: Solve for x
    x = 11,406,216,420.95/123,509.54
  6. Step 6: Final answer
    x = 92,350.89

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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.