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Finding the Fourth Proportional to 651.57, 977.51 and 218.71

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Solution

The fourth proportional to 651.57, 977.51 and 218.71 is: 328.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.57 : 977.51 = 218.71 : x
  2. Step 2: Convert to fraction form
    651.57/977.51 = 218.71/x
  3. Step 3: Cross multiply
    651.57x = 977.51 × 218.71
  4. Step 4: Simplify right side
    651.57x = 213,791.21
  5. Step 5: Solve for x
    x = 213,791.21/651.57
  6. Step 6: Final answer
    x = 328.12

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Double scale
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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.