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Finding the Fourth Proportional to 672.90, 1,004.78 and 551.40

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Solution

The fourth proportional to 672.90, 1,004.78 and 551.40 is: 823.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.90 : 1,004.78 = 551.40 : x
  2. Step 2: Convert to fraction form
    672.90/1,004.78 = 551.40/x
  3. Step 3: Cross multiply
    672.90x = 1,004.78 × 551.40
  4. Step 4: Simplify right side
    672.90x = 554,035.69
  5. Step 5: Solve for x
    x = 554,035.69/672.90
  6. Step 6: Final answer
    x = 823.36

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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.