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Finding the Fourth Proportional to 885.05, 1,221.53 and 553.40

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Solution

The fourth proportional to 885.05, 1,221.53 and 553.40 is: 763.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.05 : 1,221.53 = 553.40 : x
  2. Step 2: Convert to fraction form
    885.05/1,221.53 = 553.40/x
  3. Step 3: Cross multiply
    885.05x = 1,221.53 × 553.40
  4. Step 4: Simplify right side
    885.05x = 675,985.83
  5. Step 5: Solve for x
    x = 675,985.83/885.05
  6. Step 6: Final answer
    x = 763.79

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Half scale
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Double scale
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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.