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Finding the Fourth Proportional to 761.71, 1,142.67 and 340.03

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Solution

The fourth proportional to 761.71, 1,142.67 and 340.03 is: 510.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.71 : 1,142.67 = 340.03 : x
  2. Step 2: Convert to fraction form
    761.71/1,142.67 = 340.03/x
  3. Step 3: Cross multiply
    761.71x = 1,142.67 × 340.03
  4. Step 4: Simplify right side
    761.71x = 388,542.08
  5. Step 5: Solve for x
    x = 388,542.08/761.71
  6. Step 6: Final answer
    x = 510.09

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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.