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Finding the Fourth Proportional to 988.31, 1,363.86 and 568.74

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Solution

The fourth proportional to 988.31, 1,363.86 and 568.74 is: 784.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.31 : 1,363.86 = 568.74 : x
  2. Step 2: Convert to fraction form
    988.31/1,363.86 = 568.74/x
  3. Step 3: Cross multiply
    988.31x = 1,363.86 × 568.74
  4. Step 4: Simplify right side
    988.31x = 775,678.89
  5. Step 5: Solve for x
    x = 775,678.89/988.31
  6. Step 6: Final answer
    x = 784.86

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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.