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Finding the Fourth Proportional to 583.81, 805.65 and 318.26

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Solution

The fourth proportional to 583.81, 805.65 and 318.26 is: 439.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    583.81 : 805.65 = 318.26 : x
  2. Step 2: Convert to fraction form
    583.81/805.65 = 318.26/x
  3. Step 3: Cross multiply
    583.81x = 805.65 × 318.26
  4. Step 4: Simplify right side
    583.81x = 256,406.17
  5. Step 5: Solve for x
    x = 256,406.17/583.81
  6. Step 6: Final answer
    x = 439.20

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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.