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Finding the Fourth Proportional to 586.80, 878.76 and 393.84

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Solution

The fourth proportional to 586.80, 878.76 and 393.84 is: 589.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.80 : 878.76 = 393.84 : x
  2. Step 2: Convert to fraction form
    586.80/878.76 = 393.84/x
  3. Step 3: Cross multiply
    586.80x = 878.76 × 393.84
  4. Step 4: Simplify right side
    586.80x = 346,090.84
  5. Step 5: Solve for x
    x = 346,090.84/586.80
  6. Step 6: Final answer
    x = 589.79

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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.