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Finding the Fourth Proportional to 586.40, 809.29 and 438.78

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Solution

The fourth proportional to 586.40, 809.29 and 438.78 is: 605.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.40 : 809.29 = 438.78 : x
  2. Step 2: Convert to fraction form
    586.40/809.29 = 438.78/x
  3. Step 3: Cross multiply
    586.40x = 809.29 × 438.78
  4. Step 4: Simplify right side
    586.40x = 355,097.78
  5. Step 5: Solve for x
    x = 355,097.78/586.40
  6. Step 6: Final answer
    x = 605.56

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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.