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Finding the Fourth Proportional to 885.89, 1,328.22 and 392.06

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Solution

The fourth proportional to 885.89, 1,328.22 and 392.06 is: 587.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.89 : 1,328.22 = 392.06 : x
  2. Step 2: Convert to fraction form
    885.89/1,328.22 = 392.06/x
  3. Step 3: Cross multiply
    885.89x = 1,328.22 × 392.06
  4. Step 4: Simplify right side
    885.89x = 520,741.93
  5. Step 5: Solve for x
    x = 520,741.93/885.89
  6. Step 6: Final answer
    x = 587.82

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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.