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Finding the Fourth Proportional to 403.84, 552.80 and 390.72

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Solution

The fourth proportional to 403.84, 552.80 and 390.72 is: 534.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.84 : 552.80 = 390.72 : x
  2. Step 2: Convert to fraction form
    403.84/552.80 = 390.72/x
  3. Step 3: Cross multiply
    403.84x = 552.80 × 390.72
  4. Step 4: Simplify right side
    403.84x = 215,990.02
  5. Step 5: Solve for x
    x = 215,990.02/403.84
  6. Step 6: Final answer
    x = 534.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.