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Finding the Fourth Proportional to 693.70, 956.20 and 507.21

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Solution

The fourth proportional to 693.70, 956.20 and 507.21 is: 699.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.70 : 956.20 = 507.21 : x
  2. Step 2: Convert to fraction form
    693.70/956.20 = 507.21/x
  3. Step 3: Cross multiply
    693.70x = 956.20 × 507.21
  4. Step 4: Simplify right side
    693.70x = 484,994.20
  5. Step 5: Solve for x
    x = 484,994.20/693.70
  6. Step 6: Final answer
    x = 699.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.