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Finding the Fourth Proportional to 657.05, 985.10 and 291.80

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Solution

The fourth proportional to 657.05, 985.10 and 291.80 is: 437.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.05 : 985.10 = 291.80 : x
  2. Step 2: Convert to fraction form
    657.05/985.10 = 291.80/x
  3. Step 3: Cross multiply
    657.05x = 985.10 × 291.80
  4. Step 4: Simplify right side
    657.05x = 287,453.18
  5. Step 5: Solve for x
    x = 287,453.18/657.05
  6. Step 6: Final answer
    x = 437.49

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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.