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Finding the Fourth Proportional to 1,287.92, 1,778.01 and 1,088.66

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Solution

The fourth proportional to 1,287.92, 1,778.01 and 1,088.66 is: 1,502.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.92 : 1,778.01 = 1,088.66 : x
  2. Step 2: Convert to fraction form
    1,287.92/1,778.01 = 1,088.66/x
  3. Step 3: Cross multiply
    1,287.92x = 1,778.01 × 1,088.66
  4. Step 4: Simplify right side
    1,287.92x = 1,935,648.37
  5. Step 5: Solve for x
    x = 1,935,648.37/1,287.92
  6. Step 6: Final answer
    x = 1,502.93

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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.