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Finding the Fourth Proportional to 715.74, 988.56 and 568.11

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Solution

The fourth proportional to 715.74, 988.56 and 568.11 is: 784.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.74 : 988.56 = 568.11 : x
  2. Step 2: Convert to fraction form
    715.74/988.56 = 568.11/x
  3. Step 3: Cross multiply
    715.74x = 988.56 × 568.11
  4. Step 4: Simplify right side
    715.74x = 561,610.82
  5. Step 5: Solve for x
    x = 561,610.82/715.74
  6. Step 6: Final answer
    x = 784.66

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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.