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Finding the Fourth Proportional to 885.86, 1,329.15 and 392.01

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Solution

The fourth proportional to 885.86, 1,329.15 and 392.01 is: 588.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.86 : 1,329.15 = 392.01 : x
  2. Step 2: Convert to fraction form
    885.86/1,329.15 = 392.01/x
  3. Step 3: Cross multiply
    885.86x = 1,329.15 × 392.01
  4. Step 4: Simplify right side
    885.86x = 521,040.09
  5. Step 5: Solve for x
    x = 521,040.09/885.86
  6. Step 6: Final answer
    x = 588.18

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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.