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Finding the Fourth Proportional to 507.50, 703.55 and 479.78

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Solution

The fourth proportional to 507.50, 703.55 and 479.78 is: 665.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.50 : 703.55 = 479.78 : x
  2. Step 2: Convert to fraction form
    507.50/703.55 = 479.78/x
  3. Step 3: Cross multiply
    507.50x = 703.55 × 479.78
  4. Step 4: Simplify right side
    507.50x = 337,543.30
  5. Step 5: Solve for x
    x = 337,543.30/507.50
  6. Step 6: Final answer
    x = 665.12

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.