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Finding the Fourth Proportional to 761.58, 1,141.80 and 640.08

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Solution

The fourth proportional to 761.58, 1,141.80 and 640.08 is: 959.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.58 : 1,141.80 = 640.08 : x
  2. Step 2: Convert to fraction form
    761.58/1,141.80 = 640.08/x
  3. Step 3: Cross multiply
    761.58x = 1,141.80 × 640.08
  4. Step 4: Simplify right side
    761.58x = 730,843.34
  5. Step 5: Solve for x
    x = 730,843.34/761.58
  6. Step 6: Final answer
    x = 959.64

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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.