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Finding the Fourth Proportional to 575.79, 862.47 and 390.81

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Solution

The fourth proportional to 575.79, 862.47 and 390.81 is: 585.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.79 : 862.47 = 390.81 : x
  2. Step 2: Convert to fraction form
    575.79/862.47 = 390.81/x
  3. Step 3: Cross multiply
    575.79x = 862.47 × 390.81
  4. Step 4: Simplify right side
    575.79x = 337,061.90
  5. Step 5: Solve for x
    x = 337,061.90/575.79
  6. Step 6: Final answer
    x = 585.39

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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.