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Finding the Fourth Proportional to 875.22, 1,208.15 and 665.43

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Solution

The fourth proportional to 875.22, 1,208.15 and 665.43 is: 918.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.22 : 1,208.15 = 665.43 : x
  2. Step 2: Convert to fraction form
    875.22/1,208.15 = 665.43/x
  3. Step 3: Cross multiply
    875.22x = 1,208.15 × 665.43
  4. Step 4: Simplify right side
    875.22x = 803,939.25
  5. Step 5: Solve for x
    x = 803,939.25/875.22
  6. Step 6: Final answer
    x = 918.56

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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.