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Finding the Fourth Proportional to 885.33, 1,328.40 and 612

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Solution

The fourth proportional to 885.33, 1,328.40 and 612 is: 918.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.33 : 1,328.40 = 612 : x
  2. Step 2: Convert to fraction form
    885.33/1,328.40 = 612/x
  3. Step 3: Cross multiply
    885.33x = 1,328.40 × 612
  4. Step 4: Simplify right side
    885.33x = 812,980.80
  5. Step 5: Solve for x
    x = 812,980.80/885.33
  6. Step 6: Final answer
    x = 918.28

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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.