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Finding the Fourth Proportional to 875.86, 1,208.78 and 654.43

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Solution

The fourth proportional to 875.86, 1,208.78 and 654.43 is: 903.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.86 : 1,208.78 = 654.43 : x
  2. Step 2: Convert to fraction form
    875.86/1,208.78 = 654.43/x
  3. Step 3: Cross multiply
    875.86x = 1,208.78 × 654.43
  4. Step 4: Simplify right side
    875.86x = 791,061.90
  5. Step 5: Solve for x
    x = 791,061.90/875.86
  6. Step 6: Final answer
    x = 903.18

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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.