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Finding the Fourth Proportional to 678.20, 1,017.30 and 493.70

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Solution

The fourth proportional to 678.20, 1,017.30 and 493.70 is: 740.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.20 : 1,017.30 = 493.70 : x
  2. Step 2: Convert to fraction form
    678.20/1,017.30 = 493.70/x
  3. Step 3: Cross multiply
    678.20x = 1,017.30 × 493.70
  4. Step 4: Simplify right side
    678.20x = 502,241.01
  5. Step 5: Solve for x
    x = 502,241.01/678.20
  6. Step 6: Final answer
    x = 740.55

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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.