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Finding the Fourth Proportional to 1,208.16, 1,666.56 and 815.28

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Solution

The fourth proportional to 1,208.16, 1,666.56 and 815.28 is: 1,124.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.16 : 1,666.56 = 815.28 : x
  2. Step 2: Convert to fraction form
    1,208.16/1,666.56 = 815.28/x
  3. Step 3: Cross multiply
    1,208.16x = 1,666.56 × 815.28
  4. Step 4: Simplify right side
    1,208.16x = 1,358,713.04
  5. Step 5: Solve for x
    x = 1,358,713.04/1,208.16
  6. Step 6: Final answer
    x = 1,124.61

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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.