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Finding the Fourth Proportional to 761.22, 1,140.62 and 554.84

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Solution

The fourth proportional to 761.22, 1,140.62 and 554.84 is: 831.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.22 : 1,140.62 = 554.84 : x
  2. Step 2: Convert to fraction form
    761.22/1,140.62 = 554.84/x
  3. Step 3: Cross multiply
    761.22x = 1,140.62 × 554.84
  4. Step 4: Simplify right side
    761.22x = 632,857.28
  5. Step 5: Solve for x
    x = 632,857.28/761.22
  6. Step 6: Final answer
    x = 831.37

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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.