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Finding the Fourth Proportional to 400.68, 555.53 and 387.18

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Solution

The fourth proportional to 400.68, 555.53 and 387.18 is: 536.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.68 : 555.53 = 387.18 : x
  2. Step 2: Convert to fraction form
    400.68/555.53 = 387.18/x
  3. Step 3: Cross multiply
    400.68x = 555.53 × 387.18
  4. Step 4: Simplify right side
    400.68x = 215,088.17
  5. Step 5: Solve for x
    x = 215,088.17/400.68
  6. Step 6: Final answer
    x = 536.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.