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Finding the Fourth Proportional to 885.33, 1,221.62 and 553.64

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Solution

The fourth proportional to 885.33, 1,221.62 and 553.64 is: 763.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.33 : 1,221.62 = 553.64 : x
  2. Step 2: Convert to fraction form
    885.33/1,221.62 = 553.64/x
  3. Step 3: Cross multiply
    885.33x = 1,221.62 × 553.64
  4. Step 4: Simplify right side
    885.33x = 676,328.82
  5. Step 5: Solve for x
    x = 676,328.82/885.33
  6. Step 6: Final answer
    x = 763.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.