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Finding the Fourth Proportional to 438.13, 656.32 and 291.43

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Solution

The fourth proportional to 438.13, 656.32 and 291.43 is: 436.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.13 : 656.32 = 291.43 : x
  2. Step 2: Convert to fraction form
    438.13/656.32 = 291.43/x
  3. Step 3: Cross multiply
    438.13x = 656.32 × 291.43
  4. Step 4: Simplify right side
    438.13x = 191,271.98
  5. Step 5: Solve for x
    x = 191,271.98/438.13
  6. Step 6: Final answer
    x = 436.57

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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.