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Finding the Fourth Proportional to 866.48, 1,298.88 and 379.16

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Solution

The fourth proportional to 866.48, 1,298.88 and 379.16 is: 568.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.48 : 1,298.88 = 379.16 : x
  2. Step 2: Convert to fraction form
    866.48/1,298.88 = 379.16/x
  3. Step 3: Cross multiply
    866.48x = 1,298.88 × 379.16
  4. Step 4: Simplify right side
    866.48x = 492,483.34
  5. Step 5: Solve for x
    x = 492,483.34/866.48
  6. Step 6: Final answer
    x = 568.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.