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Finding the Fourth Proportional to 612.45, 918.03 and 551.28

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Solution

The fourth proportional to 612.45, 918.03 and 551.28 is: 826.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.45 : 918.03 = 551.28 : x
  2. Step 2: Convert to fraction form
    612.45/918.03 = 551.28/x
  3. Step 3: Cross multiply
    612.45x = 918.03 × 551.28
  4. Step 4: Simplify right side
    612.45x = 506,091.58
  5. Step 5: Solve for x
    x = 506,091.58/612.45
  6. Step 6: Final answer
    x = 826.34

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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.