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Finding the Fourth Proportional to 875.10, 1,208.04 and 521.15

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Solution

The fourth proportional to 875.10, 1,208.04 and 521.15 is: 719.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.10 : 1,208.04 = 521.15 : x
  2. Step 2: Convert to fraction form
    875.10/1,208.04 = 521.15/x
  3. Step 3: Cross multiply
    875.10x = 1,208.04 × 521.15
  4. Step 4: Simplify right side
    875.10x = 629,562.05
  5. Step 5: Solve for x
    x = 629,562.05/875.10
  6. Step 6: Final answer
    x = 719.41

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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.