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Finding the Fourth Proportional to 988.32, 1,363.89 and 568.64

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Solution

The fourth proportional to 988.32, 1,363.89 and 568.64 is: 784.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.32 : 1,363.89 = 568.64 : x
  2. Step 2: Convert to fraction form
    988.32/1,363.89 = 568.64/x
  3. Step 3: Cross multiply
    988.32x = 1,363.89 × 568.64
  4. Step 4: Simplify right side
    988.32x = 775,555.59
  5. Step 5: Solve for x
    x = 775,555.59/988.32
  6. Step 6: Final answer
    x = 784.72

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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.