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Finding the Fourth Proportional to 651.69, 977.63 and 218.79

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Solution

The fourth proportional to 651.69, 977.63 and 218.79 is: 328.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.69 : 977.63 = 218.79 : x
  2. Step 2: Convert to fraction form
    651.69/977.63 = 218.79/x
  3. Step 3: Cross multiply
    651.69x = 977.63 × 218.79
  4. Step 4: Simplify right side
    651.69x = 213,894.57
  5. Step 5: Solve for x
    x = 213,894.57/651.69
  6. Step 6: Final answer
    x = 328.22

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Double scale
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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.