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Finding the Fourth Proportional to 656.74, 985.20 and 291.84

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Solution

The fourth proportional to 656.74, 985.20 and 291.84 is: 437.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.74 : 985.20 = 291.84 : x
  2. Step 2: Convert to fraction form
    656.74/985.20 = 291.84/x
  3. Step 3: Cross multiply
    656.74x = 985.20 × 291.84
  4. Step 4: Simplify right side
    656.74x = 287,520.77
  5. Step 5: Solve for x
    x = 287,520.77/656.74
  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.