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Finding the Fourth Proportional to 761.16, 1,141.56 and 298.74

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Solution

The fourth proportional to 761.16, 1,141.56 and 298.74 is: 448.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.16 : 1,141.56 = 298.74 : x
  2. Step 2: Convert to fraction form
    761.16/1,141.56 = 298.74/x
  3. Step 3: Cross multiply
    761.16x = 1,141.56 × 298.74
  4. Step 4: Simplify right side
    761.16x = 341,029.63
  5. Step 5: Solve for x
    x = 341,029.63/761.16
  6. Step 6: Final answer
    x = 448.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.