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Finding the Fourth Proportional to 988.34, 1,363.85 and 568.63

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Solution

The fourth proportional to 988.34, 1,363.85 and 568.63 is: 784.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.34 : 1,363.85 = 568.63 : x
  2. Step 2: Convert to fraction form
    988.34/1,363.85 = 568.63/x
  3. Step 3: Cross multiply
    988.34x = 1,363.85 × 568.63
  4. Step 4: Simplify right side
    988.34x = 775,527.02
  5. Step 5: Solve for x
    x = 775,527.02/988.34
  6. Step 6: Final answer
    x = 784.68

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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.