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Finding the Fourth Proportional to 303.12, 417.56 and 288.54

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Solution

The fourth proportional to 303.12, 417.56 and 288.54 is: 397.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.12 : 417.56 = 288.54 : x
  2. Step 2: Convert to fraction form
    303.12/417.56 = 288.54/x
  3. Step 3: Cross multiply
    303.12x = 417.56 × 288.54
  4. Step 4: Simplify right side
    303.12x = 120,482.76
  5. Step 5: Solve for x
    x = 120,482.76/303.12
  6. Step 6: Final answer
    x = 397.48

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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.