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Finding the Fourth Proportional to 888.16, 1,330.78 and 540.45

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Solution

The fourth proportional to 888.16, 1,330.78 and 540.45 is: 809.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.16 : 1,330.78 = 540.45 : x
  2. Step 2: Convert to fraction form
    888.16/1,330.78 = 540.45/x
  3. Step 3: Cross multiply
    888.16x = 1,330.78 × 540.45
  4. Step 4: Simplify right side
    888.16x = 719,213.40
  5. Step 5: Solve for x
    x = 719,213.40/888.16
  6. Step 6: Final answer
    x = 809.78

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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.