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Finding the Fourth Proportional to 718.19, 991.01 and 403.40

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Solution

The fourth proportional to 718.19, 991.01 and 403.40 is: 556.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.19 : 991.01 = 403.40 : x
  2. Step 2: Convert to fraction form
    718.19/991.01 = 403.40/x
  3. Step 3: Cross multiply
    718.19x = 991.01 × 403.40
  4. Step 4: Simplify right side
    718.19x = 399,773.89
  5. Step 5: Solve for x
    x = 399,773.89/718.19
  6. Step 6: Final answer
    x = 556.64

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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.