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Finding the Fourth Proportional to 885.78, 1,328.06 and 724.18

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Solution

The fourth proportional to 885.78, 1,328.06 and 724.18 is: 1,085.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.78 : 1,328.06 = 724.18 : x
  2. Step 2: Convert to fraction form
    885.78/1,328.06 = 724.18/x
  3. Step 3: Cross multiply
    885.78x = 1,328.06 × 724.18
  4. Step 4: Simplify right side
    885.78x = 961,754.49
  5. Step 5: Solve for x
    x = 961,754.49/885.78
  6. Step 6: Final answer
    x = 1,085.77

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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.