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Finding the Fourth Proportional to 402.15, 555.72 and 303.75

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Solution

The fourth proportional to 402.15, 555.72 and 303.75 is: 419.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.15 : 555.72 = 303.75 : x
  2. Step 2: Convert to fraction form
    402.15/555.72 = 303.75/x
  3. Step 3: Cross multiply
    402.15x = 555.72 × 303.75
  4. Step 4: Simplify right side
    402.15x = 168,799.95
  5. Step 5: Solve for x
    x = 168,799.95/402.15
  6. Step 6: Final answer
    x = 419.74

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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.