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Finding the Fourth Proportional to 585.56, 878.63 and 390.69

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Solution

The fourth proportional to 585.56, 878.63 and 390.69 is: 586.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.56 : 878.63 = 390.69 : x
  2. Step 2: Convert to fraction form
    585.56/878.63 = 390.69/x
  3. Step 3: Cross multiply
    585.56x = 878.63 × 390.69
  4. Step 4: Simplify right side
    585.56x = 343,270.00
  5. Step 5: Solve for x
    x = 343,270.00/585.56
  6. Step 6: Final answer
    x = 586.23

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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.