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Finding the Fourth Proportional to 657.21, 986.03 and 291.98

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Solution

The fourth proportional to 657.21, 986.03 and 291.98 is: 438.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.21 : 986.03 = 291.98 : x
  2. Step 2: Convert to fraction form
    657.21/986.03 = 291.98/x
  3. Step 3: Cross multiply
    657.21x = 986.03 × 291.98
  4. Step 4: Simplify right side
    657.21x = 287,901.04
  5. Step 5: Solve for x
    x = 287,901.04/657.21
  6. Step 6: Final answer
    x = 438.07

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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.