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Finding the Fourth Proportional to 761.54, 1,142.19 and 328.58

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Solution

The fourth proportional to 761.54, 1,142.19 and 328.58 is: 492.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.54 : 1,142.19 = 328.58 : x
  2. Step 2: Convert to fraction form
    761.54/1,142.19 = 328.58/x
  3. Step 3: Cross multiply
    761.54x = 1,142.19 × 328.58
  4. Step 4: Simplify right side
    761.54x = 375,300.79
  5. Step 5: Solve for x
    x = 375,300.79/761.54
  6. Step 6: Final answer
    x = 492.82

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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.