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Finding the Fourth Proportional to 884.76, 1,221.14 and 553.40

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Solution

The fourth proportional to 884.76, 1,221.14 and 553.40 is: 763.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.76 : 1,221.14 = 553.40 : x
  2. Step 2: Convert to fraction form
    884.76/1,221.14 = 553.40/x
  3. Step 3: Cross multiply
    884.76x = 1,221.14 × 553.40
  4. Step 4: Simplify right side
    884.76x = 675,778.88
  5. Step 5: Solve for x
    x = 675,778.88/884.76
  6. Step 6: Final answer
    x = 763.80

Related Problems

Find fourth proportional to 442.38, 610.57 and 276.70
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.