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Finding the Fourth Proportional to 665.40, 1,000.35 and 544.56

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Solution

The fourth proportional to 665.40, 1,000.35 and 544.56 is: 818.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.40 : 1,000.35 = 544.56 : x
  2. Step 2: Convert to fraction form
    665.40/1,000.35 = 544.56/x
  3. Step 3: Cross multiply
    665.40x = 1,000.35 × 544.56
  4. Step 4: Simplify right side
    665.40x = 544,750.60
  5. Step 5: Solve for x
    x = 544,750.60/665.40
  6. Step 6: Final answer
    x = 818.68

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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.