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Finding the Fourth Proportional to 583.76, 805.92 and 387.20

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Solution

The fourth proportional to 583.76, 805.92 and 387.20 is: 534.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    583.76 : 805.92 = 387.20 : x
  2. Step 2: Convert to fraction form
    583.76/805.92 = 387.20/x
  3. Step 3: Cross multiply
    583.76x = 805.92 × 387.20
  4. Step 4: Simplify right side
    583.76x = 312,052.22
  5. Step 5: Solve for x
    x = 312,052.22/583.76
  6. Step 6: Final answer
    x = 534.56

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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.