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Finding the Fourth Proportional to 875.61, 1,207.79 and 521.28

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Solution

The fourth proportional to 875.61, 1,207.79 and 521.28 is: 719.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.61 : 1,207.79 = 521.28 : x
  2. Step 2: Convert to fraction form
    875.61/1,207.79 = 521.28/x
  3. Step 3: Cross multiply
    875.61x = 1,207.79 × 521.28
  4. Step 4: Simplify right side
    875.61x = 629,588.13
  5. Step 5: Solve for x
    x = 629,588.13/875.61
  6. Step 6: Final answer
    x = 719.03

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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.