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Finding the Fourth Proportional to 871.38, 1,202.10 and 556.49

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Solution

The fourth proportional to 871.38, 1,202.10 and 556.49 is: 767.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.38 : 1,202.10 = 556.49 : x
  2. Step 2: Convert to fraction form
    871.38/1,202.10 = 556.49/x
  3. Step 3: Cross multiply
    871.38x = 1,202.10 × 556.49
  4. Step 4: Simplify right side
    871.38x = 668,952.01
  5. Step 5: Solve for x
    x = 668,952.01/871.38
  6. Step 6: Final answer
    x = 767.69

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.