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Finding the Fourth Proportional to 718.39, 991.59 and 466.31

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Solution

The fourth proportional to 718.39, 991.59 and 466.31 is: 643.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.39 : 991.59 = 466.31 : x
  2. Step 2: Convert to fraction form
    718.39/991.59 = 466.31/x
  3. Step 3: Cross multiply
    718.39x = 991.59 × 466.31
  4. Step 4: Simplify right side
    718.39x = 462,381.04
  5. Step 5: Solve for x
    x = 462,381.04/718.39
  6. Step 6: Final answer
    x = 643.64

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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.