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Finding the Fourth Proportional to 431.16, 647.06 and 203.32

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Solution

The fourth proportional to 431.16, 647.06 and 203.32 is: 305.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.16 : 647.06 = 203.32 : x
  2. Step 2: Convert to fraction form
    431.16/647.06 = 203.32/x
  3. Step 3: Cross multiply
    431.16x = 647.06 × 203.32
  4. Step 4: Simplify right side
    431.16x = 131,560.24
  5. Step 5: Solve for x
    x = 131,560.24/431.16
  6. Step 6: Final answer
    x = 305.13

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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.