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Finding the Fourth Proportional to 885.61, 1,328.49 and 398.71

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Solution

The fourth proportional to 885.61, 1,328.49 and 398.71 is: 598.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.61 : 1,328.49 = 398.71 : x
  2. Step 2: Convert to fraction form
    885.61/1,328.49 = 398.71/x
  3. Step 3: Cross multiply
    885.61x = 1,328.49 × 398.71
  4. Step 4: Simplify right side
    885.61x = 529,682.25
  5. Step 5: Solve for x
    x = 529,682.25/885.61
  6. Step 6: Final answer
    x = 598.10

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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.