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Finding the Fourth Proportional to 666.28, 918.88 and 417.32

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Solution

The fourth proportional to 666.28, 918.88 and 417.32 is: 575.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.28 : 918.88 = 417.32 : x
  2. Step 2: Convert to fraction form
    666.28/918.88 = 417.32/x
  3. Step 3: Cross multiply
    666.28x = 918.88 × 417.32
  4. Step 4: Simplify right side
    666.28x = 383,467.00
  5. Step 5: Solve for x
    x = 383,467.00/666.28
  6. Step 6: Final answer
    x = 575.53

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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.