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Finding the Fourth Proportional to 840.48, 1,260.72 and 551.76

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Solution

The fourth proportional to 840.48, 1,260.72 and 551.76 is: 827.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.48 : 1,260.72 = 551.76 : x
  2. Step 2: Convert to fraction form
    840.48/1,260.72 = 551.76/x
  3. Step 3: Cross multiply
    840.48x = 1,260.72 × 551.76
  4. Step 4: Simplify right side
    840.48x = 695,614.87
  5. Step 5: Solve for x
    x = 695,614.87/840.48
  6. Step 6: Final answer
    x = 827.64

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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.