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Finding the Fourth Proportional to 651.74, 977.61 and 218.90

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Solution

The fourth proportional to 651.74, 977.61 and 218.90 is: 328.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.74 : 977.61 = 218.90 : x
  2. Step 2: Convert to fraction form
    651.74/977.61 = 218.90/x
  3. Step 3: Cross multiply
    651.74x = 977.61 × 218.90
  4. Step 4: Simplify right side
    651.74x = 213,993.94
  5. Step 5: Solve for x
    x = 213,993.94/651.74
  6. Step 6: Final answer
    x = 328.34

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Double scale
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Similar ratio
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1.5x scale

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.