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Finding the Fourth Proportional to 401.32, 598.40 and 400.55

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Solution

The fourth proportional to 401.32, 598.40 and 400.55 is: 597.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.32 : 598.40 = 400.55 : x
  2. Step 2: Convert to fraction form
    401.32/598.40 = 400.55/x
  3. Step 3: Cross multiply
    401.32x = 598.40 × 400.55
  4. Step 4: Simplify right side
    401.32x = 239,689.12
  5. Step 5: Solve for x
    x = 239,689.12/401.32
  6. Step 6: Final answer
    x = 597.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.