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Finding the Fourth Proportional to 651.61, 977.56 and 218.75

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Solution

The fourth proportional to 651.61, 977.56 and 218.75 is: 328.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.61 : 977.56 = 218.75 : x
  2. Step 2: Convert to fraction form
    651.61/977.56 = 218.75/x
  3. Step 3: Cross multiply
    651.61x = 977.56 × 218.75
  4. Step 4: Simplify right side
    651.61x = 213,840.16
  5. Step 5: Solve for x
    x = 213,840.16/651.61
  6. Step 6: Final answer
    x = 328.17

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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.