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Finding the Fourth Proportional to 612.54, 918.90 and 521.82

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Solution

The fourth proportional to 612.54, 918.90 and 521.82 is: 782.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.54 : 918.90 = 521.82 : x
  2. Step 2: Convert to fraction form
    612.54/918.90 = 521.82/x
  3. Step 3: Cross multiply
    612.54x = 918.90 × 521.82
  4. Step 4: Simplify right side
    612.54x = 479,500.40
  5. Step 5: Solve for x
    x = 479,500.40/612.54
  6. Step 6: Final answer
    x = 782.81

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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.