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Finding the Fourth Proportional to 885.76, 1,328.92 and 424.14

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Solution

The fourth proportional to 885.76, 1,328.92 and 424.14 is: 636.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.76 : 1,328.92 = 424.14 : x
  2. Step 2: Convert to fraction form
    885.76/1,328.92 = 424.14/x
  3. Step 3: Cross multiply
    885.76x = 1,328.92 × 424.14
  4. Step 4: Simplify right side
    885.76x = 563,648.13
  5. Step 5: Solve for x
    x = 563,648.13/885.76
  6. Step 6: Final answer
    x = 636.34

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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.