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Finding the Fourth Proportional to 656.56, 985.20 and 291.60

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Solution

The fourth proportional to 656.56, 985.20 and 291.60 is: 437.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.56 : 985.20 = 291.60 : x
  2. Step 2: Convert to fraction form
    656.56/985.20 = 291.60/x
  3. Step 3: Cross multiply
    656.56x = 985.20 × 291.60
  4. Step 4: Simplify right side
    656.56x = 287,284.32
  5. Step 5: Solve for x
    x = 287,284.32/656.56
  6. Step 6: Final answer
    x = 437.56

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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.