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Finding the Fourth Proportional to 885.58, 1,328.10 and 398.86

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Solution

The fourth proportional to 885.58, 1,328.10 and 398.86 is: 598.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.58 : 1,328.10 = 398.86 : x
  2. Step 2: Convert to fraction form
    885.58/1,328.10 = 398.86/x
  3. Step 3: Cross multiply
    885.58x = 1,328.10 × 398.86
  4. Step 4: Simplify right side
    885.58x = 529,725.97
  5. Step 5: Solve for x
    x = 529,725.97/885.58
  6. Step 6: Final answer
    x = 598.17

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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.