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Finding the Fourth Proportional to 656.72, 985.41 and 291.77

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Solution

The fourth proportional to 656.72, 985.41 and 291.77 is: 437.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.72 : 985.41 = 291.77 : x
  2. Step 2: Convert to fraction form
    656.72/985.41 = 291.77/x
  3. Step 3: Cross multiply
    656.72x = 985.41 × 291.77
  4. Step 4: Simplify right side
    656.72x = 287,508.15
  5. Step 5: Solve for x
    x = 287,508.15/656.72
  6. Step 6: Final answer
    x = 437.80

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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.