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Finding the Fourth Proportional to 123,585.51, 170,490.64 and 72,581.70

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Solution

The fourth proportional to 123,585.51, 170,490.64 and 72,581.70 is: 100,129.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,585.51 : 170,490.64 = 72,581.70 : x
  2. Step 2: Convert to fraction form
    123,585.51/170,490.64 = 72,581.70/x
  3. Step 3: Cross multiply
    123,585.51x = 170,490.64 × 72,581.70
  4. Step 4: Simplify right side
    123,585.51x = 12,374,500,485.29
  5. Step 5: Solve for x
    x = 12,374,500,485.29/123,585.51
  6. Step 6: Final answer
    x = 100,129.06

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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.