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Finding the Fourth Proportional to 885, 1,327.98 and 429

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Solution

The fourth proportional to 885, 1,327.98 and 429 is: 643.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    885 : 1,327.98 = 429 : x
  2. Step 2: Convert to fraction form
    885/1,327.98 = 429/x
  3. Step 3: Cross multiply
    885x = 1,327.98 × 429
  4. Step 4: Simplify right side
    885x = 569,703.42
  5. Step 5: Solve for x
    x = 569,703.42/885
  6. Step 6: Final answer
    x = 643.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.