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Finding the Fourth Proportional to 507.76, 700.40 and 311.20

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Solution

The fourth proportional to 507.76, 700.40 and 311.20 is: 429.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.76 : 700.40 = 311.20 : x
  2. Step 2: Convert to fraction form
    507.76/700.40 = 311.20/x
  3. Step 3: Cross multiply
    507.76x = 700.40 × 311.20
  4. Step 4: Simplify right side
    507.76x = 217,964.48
  5. Step 5: Solve for x
    x = 217,964.48/507.76
  6. Step 6: Final answer
    x = 429.27

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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.