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Finding the Fourth Proportional to 559.49, 839.43 and 392.89

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Solution

The fourth proportional to 559.49, 839.43 and 392.89 is: 589.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.49 : 839.43 = 392.89 : x
  2. Step 2: Convert to fraction form
    559.49/839.43 = 392.89/x
  3. Step 3: Cross multiply
    559.49x = 839.43 × 392.89
  4. Step 4: Simplify right side
    559.49x = 329,801.69
  5. Step 5: Solve for x
    x = 329,801.69/559.49
  6. Step 6: Final answer
    x = 589.47

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1.5x scale

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.