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Finding the Fourth Proportional to 875.13, 1,207.49 and 521.03

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Solution

The fourth proportional to 875.13, 1,207.49 and 521.03 is: 718.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.13 : 1,207.49 = 521.03 : x
  2. Step 2: Convert to fraction form
    875.13/1,207.49 = 521.03/x
  3. Step 3: Cross multiply
    875.13x = 1,207.49 × 521.03
  4. Step 4: Simplify right side
    875.13x = 629,129.87
  5. Step 5: Solve for x
    x = 629,129.87/875.13
  6. Step 6: Final answer
    x = 718.90

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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.