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Finding the Fourth Proportional to 875.78, 1,208.55 and 477.43

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Solution

The fourth proportional to 875.78, 1,208.55 and 477.43 is: 658.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.78 : 1,208.55 = 477.43 : x
  2. Step 2: Convert to fraction form
    875.78/1,208.55 = 477.43/x
  3. Step 3: Cross multiply
    875.78x = 1,208.55 × 477.43
  4. Step 4: Simplify right side
    875.78x = 576,998.03
  5. Step 5: Solve for x
    x = 576,998.03/875.78
  6. Step 6: Final answer
    x = 658.84

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1.5x scale

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.