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Finding the Fourth Proportional to 431.50, 647.40 and 171.35

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Solution

The fourth proportional to 431.50, 647.40 and 171.35 is: 257.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.50 : 647.40 = 171.35 : x
  2. Step 2: Convert to fraction form
    431.50/647.40 = 171.35/x
  3. Step 3: Cross multiply
    431.50x = 647.40 × 171.35
  4. Step 4: Simplify right side
    431.50x = 110,931.99
  5. Step 5: Solve for x
    x = 110,931.99/431.50
  6. Step 6: Final answer
    x = 257.08

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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.