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Finding the Fourth Proportional to 875.20, 1,313.34 and 388.66

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Solution

The fourth proportional to 875.20, 1,313.34 and 388.66 is: 583.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.20 : 1,313.34 = 388.66 : x
  2. Step 2: Convert to fraction form
    875.20/1,313.34 = 388.66/x
  3. Step 3: Cross multiply
    875.20x = 1,313.34 × 388.66
  4. Step 4: Simplify right side
    875.20x = 510,442.72
  5. Step 5: Solve for x
    x = 510,442.72/875.20
  6. Step 6: Final answer
    x = 583.23

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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.