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Finding the Fourth Proportional to 875.21, 1,313.01 and 387.59

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Solution

The fourth proportional to 875.21, 1,313.01 and 387.59 is: 581.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.21 : 1,313.01 = 387.59 : x
  2. Step 2: Convert to fraction form
    875.21/1,313.01 = 387.59/x
  3. Step 3: Cross multiply
    875.21x = 1,313.01 × 387.59
  4. Step 4: Simplify right side
    875.21x = 508,902.98
  5. Step 5: Solve for x
    x = 508,902.98/875.21
  6. Step 6: Final answer
    x = 581.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.