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Finding the Fourth Proportional to 718.17, 990.39 and 570.54

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Solution

The fourth proportional to 718.17, 990.39 and 570.54 is: 786.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.17 : 990.39 = 570.54 : x
  2. Step 2: Convert to fraction form
    718.17/990.39 = 570.54/x
  3. Step 3: Cross multiply
    718.17x = 990.39 × 570.54
  4. Step 4: Simplify right side
    718.17x = 565,057.11
  5. Step 5: Solve for x
    x = 565,057.11/718.17
  6. Step 6: Final answer
    x = 786.80

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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.