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Finding the Third Proportional to 431 and 478

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Solution

The third proportional to 431 and 478 is: 530.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    431 : 478 = 478 : x
  2. Step 2: Convert to fraction form
    431/478 = 478/x
  3. Step 3: Cross multiply
    431x = 478 × 478
  4. Step 4: Simplify right side
    431x = 228,484
  5. Step 5: Solve for x
    x = 228,484/431
  6. Step 6: Final answer
    x = 530.13

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.