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Finding the Fourth Proportional to 840.24, 1,254.02 and 818.40

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Solution

The fourth proportional to 840.24, 1,254.02 and 818.40 is: 1,221.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.24 : 1,254.02 = 818.40 : x
  2. Step 2: Convert to fraction form
    840.24/1,254.02 = 818.40/x
  3. Step 3: Cross multiply
    840.24x = 1,254.02 × 818.40
  4. Step 4: Simplify right side
    840.24x = 1,026,289.97
  5. Step 5: Solve for x
    x = 1,026,289.97/840.24
  6. Step 6: Final answer
    x = 1,221.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.