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Finding the Fourth Proportional to 885.47, 1,328.81 and 611.82

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Solution

The fourth proportional to 885.47, 1,328.81 and 611.82 is: 918.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.47 : 1,328.81 = 611.82 : x
  2. Step 2: Convert to fraction form
    885.47/1,328.81 = 611.82/x
  3. Step 3: Cross multiply
    885.47x = 1,328.81 × 611.82
  4. Step 4: Simplify right side
    885.47x = 812,989.48
  5. Step 5: Solve for x
    x = 812,989.48/885.47
  6. Step 6: Final answer
    x = 918.15

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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.