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Finding the Fourth Proportional to 885.91, 1,328.56 and 424.21

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Solution

The fourth proportional to 885.91, 1,328.56 and 424.21 is: 636.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.91 : 1,328.56 = 424.21 : x
  2. Step 2: Convert to fraction form
    885.91/1,328.56 = 424.21/x
  3. Step 3: Cross multiply
    885.91x = 1,328.56 × 424.21
  4. Step 4: Simplify right side
    885.91x = 563,588.44
  5. Step 5: Solve for x
    x = 563,588.44/885.91
  6. Step 6: Final answer
    x = 636.17

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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.