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Finding the Fourth Proportional to 651.68, 977.56 and 218.80

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Solution

The fourth proportional to 651.68, 977.56 and 218.80 is: 328.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.68 : 977.56 = 218.80 : x
  2. Step 2: Convert to fraction form
    651.68/977.56 = 218.80/x
  3. Step 3: Cross multiply
    651.68x = 977.56 × 218.80
  4. Step 4: Simplify right side
    651.68x = 213,890.13
  5. Step 5: Solve for x
    x = 213,890.13/651.68
  6. Step 6: Final answer
    x = 328.21

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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.