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Finding the Fourth Proportional to 170,889.72, 256,386.51 and 121,066.20

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Solution

The fourth proportional to 170,889.72, 256,386.51 and 121,066.20 is: 181,636.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,889.72 : 256,386.51 = 121,066.20 : x
  2. Step 2: Convert to fraction form
    170,889.72/256,386.51 = 121,066.20/x
  3. Step 3: Cross multiply
    170,889.72x = 256,386.51 × 121,066.20
  4. Step 4: Simplify right side
    170,889.72x = 31,039,740,496.96
  5. Step 5: Solve for x
    x = 31,039,740,496.96/170,889.72
  6. Step 6: Final answer
    x = 181,636.09

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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.