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Finding the Fourth Proportional to 431.69, 647.40 and 188.15

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Solution

The fourth proportional to 431.69, 647.40 and 188.15 is: 282.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.69 : 647.40 = 188.15 : x
  2. Step 2: Convert to fraction form
    431.69/647.40 = 188.15/x
  3. Step 3: Cross multiply
    431.69x = 647.40 × 188.15
  4. Step 4: Simplify right side
    431.69x = 121,808.31
  5. Step 5: Solve for x
    x = 121,808.31/431.69
  6. Step 6: Final answer
    x = 282.17

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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.