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Finding the Fourth Proportional to 761.16, 1,134.42 and 722.28

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Solution

The fourth proportional to 761.16, 1,134.42 and 722.28 is: 1,076.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.16 : 1,134.42 = 722.28 : x
  2. Step 2: Convert to fraction form
    761.16/1,134.42 = 722.28/x
  3. Step 3: Cross multiply
    761.16x = 1,134.42 × 722.28
  4. Step 4: Simplify right side
    761.16x = 819,368.88
  5. Step 5: Solve for x
    x = 819,368.88/761.16
  6. Step 6: Final answer
    x = 1,076.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.