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Finding the Fourth Proportional to 761.34, 1,141.54 and 328.13

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Solution

The fourth proportional to 761.34, 1,141.54 and 328.13 is: 491.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.34 : 1,141.54 = 328.13 : x
  2. Step 2: Convert to fraction form
    761.34/1,141.54 = 328.13/x
  3. Step 3: Cross multiply
    761.34x = 1,141.54 × 328.13
  4. Step 4: Simplify right side
    761.34x = 374,566.99
  5. Step 5: Solve for x
    x = 374,566.99/761.34
  6. Step 6: Final answer
    x = 491.98

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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.