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Finding the Fourth Proportional to 656.67, 985.10 and 291.45

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Solution

The fourth proportional to 656.67, 985.10 and 291.45 is: 437.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.67 : 985.10 = 291.45 : x
  2. Step 2: Convert to fraction form
    656.67/985.10 = 291.45/x
  3. Step 3: Cross multiply
    656.67x = 985.10 × 291.45
  4. Step 4: Simplify right side
    656.67x = 287,105.94
  5. Step 5: Solve for x
    x = 287,105.94/656.67
  6. Step 6: Final answer
    x = 437.21

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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.