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Finding the Fourth Proportional to 718.81, 991.90 and 404.01

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Solution

The fourth proportional to 718.81, 991.90 and 404.01 is: 557.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.81 : 991.90 = 404.01 : x
  2. Step 2: Convert to fraction form
    718.81/991.90 = 404.01/x
  3. Step 3: Cross multiply
    718.81x = 991.90 × 404.01
  4. Step 4: Simplify right side
    718.81x = 400,735.40
  5. Step 5: Solve for x
    x = 400,735.40/718.81
  6. Step 6: Final answer
    x = 557.50

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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.