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Finding the Fourth Proportional to 431.74, 647.50 and 158.02

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Solution

The fourth proportional to 431.74, 647.50 and 158.02 is: 236.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.74 : 647.50 = 158.02 : x
  2. Step 2: Convert to fraction form
    431.74/647.50 = 158.02/x
  3. Step 3: Cross multiply
    431.74x = 647.50 × 158.02
  4. Step 4: Simplify right side
    431.74x = 102,317.95
  5. Step 5: Solve for x
    x = 102,317.95/431.74
  6. Step 6: Final answer
    x = 236.99

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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.