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Finding the Fourth Proportional to 507.07, 699.65 and 307.86

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Solution

The fourth proportional to 507.07, 699.65 and 307.86 is: 424.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.07 : 699.65 = 307.86 : x
  2. Step 2: Convert to fraction form
    507.07/699.65 = 307.86/x
  3. Step 3: Cross multiply
    507.07x = 699.65 × 307.86
  4. Step 4: Simplify right side
    507.07x = 215,391.24
  5. Step 5: Solve for x
    x = 215,391.24/507.07
  6. Step 6: Final answer
    x = 424.78

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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.