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Finding the Fourth Proportional to 585.79, 878.20 and 402.64

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Solution

The fourth proportional to 585.79, 878.20 and 402.64 is: 603.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.79 : 878.20 = 402.64 : x
  2. Step 2: Convert to fraction form
    585.79/878.20 = 402.64/x
  3. Step 3: Cross multiply
    585.79x = 878.20 × 402.64
  4. Step 4: Simplify right side
    585.79x = 353,595.25
  5. Step 5: Solve for x
    x = 353,595.25/585.79
  6. Step 6: Final answer
    x = 603.62

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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.