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Finding the Fourth Proportional to 840.72, 1,260.66 and 353.64

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Solution

The fourth proportional to 840.72, 1,260.66 and 353.64 is: 530.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.72 : 1,260.66 = 353.64 : x
  2. Step 2: Convert to fraction form
    840.72/1,260.66 = 353.64/x
  3. Step 3: Cross multiply
    840.72x = 1,260.66 × 353.64
  4. Step 4: Simplify right side
    840.72x = 445,819.80
  5. Step 5: Solve for x
    x = 445,819.80/840.72
  6. Step 6: Final answer
    x = 530.28

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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.