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Finding the Fourth Proportional to 666.98, 920.40 and 368.22

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Solution

The fourth proportional to 666.98, 920.40 and 368.22 is: 508.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.98 : 920.40 = 368.22 : x
  2. Step 2: Convert to fraction form
    666.98/920.40 = 368.22/x
  3. Step 3: Cross multiply
    666.98x = 920.40 × 368.22
  4. Step 4: Simplify right side
    666.98x = 338,909.69
  5. Step 5: Solve for x
    x = 338,909.69/666.98
  6. Step 6: Final answer
    x = 508.13

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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.