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Finding the Fourth Proportional to 718.10, 991.03 and 403.38

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Solution

The fourth proportional to 718.10, 991.03 and 403.38 is: 556.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.10 : 991.03 = 403.38 : x
  2. Step 2: Convert to fraction form
    718.10/991.03 = 403.38/x
  3. Step 3: Cross multiply
    718.10x = 991.03 × 403.38
  4. Step 4: Simplify right side
    718.10x = 399,760.67
  5. Step 5: Solve for x
    x = 399,760.67/718.10
  6. Step 6: Final answer
    x = 556.70

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1.5x scale

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.