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Finding the Fourth Proportional to 666.65, 920.03 and 401.13

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Solution

The fourth proportional to 666.65, 920.03 and 401.13 is: 553.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.65 : 920.03 = 401.13 : x
  2. Step 2: Convert to fraction form
    666.65/920.03 = 401.13/x
  3. Step 3: Cross multiply
    666.65x = 920.03 × 401.13
  4. Step 4: Simplify right side
    666.65x = 369,051.63
  5. Step 5: Solve for x
    x = 369,051.63/666.65
  6. Step 6: Final answer
    x = 553.59

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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.