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Finding the Fourth Proportional to 718.00, 990.75 and 403.20

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Solution

The fourth proportional to 718.00, 990.75 and 403.20 is: 556.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.00 : 990.75 = 403.20 : x
  2. Step 2: Convert to fraction form
    718.00/990.75 = 403.20/x
  3. Step 3: Cross multiply
    718.00x = 990.75 × 403.20
  4. Step 4: Simplify right side
    718.00x = 399,465.45
  5. Step 5: Solve for x
    x = 399,465.45/718.00
  6. Step 6: Final answer
    x = 556.36

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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.