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Finding the Fourth Proportional to 886.38, 1,222.29 and 621.06

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Solution

The fourth proportional to 886.38, 1,222.29 and 621.06 is: 856.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.38 : 1,222.29 = 621.06 : x
  2. Step 2: Convert to fraction form
    886.38/1,222.29 = 621.06/x
  3. Step 3: Cross multiply
    886.38x = 1,222.29 × 621.06
  4. Step 4: Simplify right side
    886.38x = 759,115.43
  5. Step 5: Solve for x
    x = 759,115.43/886.38
  6. Step 6: Final answer
    x = 856.42

Related Problems

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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.