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Finding the Fourth Proportional to 885.19, 1,328.19 and 398.38

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Solution

The fourth proportional to 885.19, 1,328.19 and 398.38 is: 597.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.19 : 1,328.19 = 398.38 : x
  2. Step 2: Convert to fraction form
    885.19/1,328.19 = 398.38/x
  3. Step 3: Cross multiply
    885.19x = 1,328.19 × 398.38
  4. Step 4: Simplify right side
    885.19x = 529,124.33
  5. Step 5: Solve for x
    x = 529,124.33/885.19
  6. Step 6: Final answer
    x = 597.75

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1.5x scale

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.