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Finding the Fourth Proportional to 715.21, 987.15 and 466.09

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Solution

The fourth proportional to 715.21, 987.15 and 466.09 is: 643.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.21 : 987.15 = 466.09 : x
  2. Step 2: Convert to fraction form
    715.21/987.15 = 466.09/x
  3. Step 3: Cross multiply
    715.21x = 987.15 × 466.09
  4. Step 4: Simplify right side
    715.21x = 460,105.58
  5. Step 5: Solve for x
    x = 460,105.58/715.21
  6. Step 6: Final answer
    x = 643.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.