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Finding the Fourth Proportional to 507.32, 699.40 and 320.71

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Solution

The fourth proportional to 507.32, 699.40 and 320.71 is: 442.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.32 : 699.40 = 320.71 : x
  2. Step 2: Convert to fraction form
    507.32/699.40 = 320.71/x
  3. Step 3: Cross multiply
    507.32x = 699.40 × 320.71
  4. Step 4: Simplify right side
    507.32x = 224,304.65
  5. Step 5: Solve for x
    x = 224,304.65/507.32
  6. Step 6: Final answer
    x = 442.14

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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.