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Finding the Fourth Proportional to 612.60, 921.03 and 491.71

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Solution

The fourth proportional to 612.60, 921.03 and 491.71 is: 739.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.60 : 921.03 = 491.71 : x
  2. Step 2: Convert to fraction form
    612.60/921.03 = 491.71/x
  3. Step 3: Cross multiply
    612.60x = 921.03 × 491.71
  4. Step 4: Simplify right side
    612.60x = 452,879.66
  5. Step 5: Solve for x
    x = 452,879.66/612.60
  6. Step 6: Final answer
    x = 739.27

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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.