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Finding the Fourth Proportional to 431.82, 646.98 and 215.52

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Solution

The fourth proportional to 431.82, 646.98 and 215.52 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.82 : 646.98 = 215.52 : x
  2. Step 2: Convert to fraction form
    431.82/646.98 = 215.52/x
  3. Step 3: Cross multiply
    431.82x = 646.98 × 215.52
  4. Step 4: Simplify right side
    431.82x = 139,437.13
  5. Step 5: Solve for x
    x = 139,437.13/431.82
  6. Step 6: Final answer
    x = 322.91

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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.