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Finding the Fourth Proportional to 666.18, 918.95 and 404.01

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Solution

The fourth proportional to 666.18, 918.95 and 404.01 is: 557.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.18 : 918.95 = 404.01 : x
  2. Step 2: Convert to fraction form
    666.18/918.95 = 404.01/x
  3. Step 3: Cross multiply
    666.18x = 918.95 × 404.01
  4. Step 4: Simplify right side
    666.18x = 371,262.97
  5. Step 5: Solve for x
    x = 371,262.97/666.18
  6. Step 6: Final answer
    x = 557.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.