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Finding the Fourth Proportional to 761.48, 1,140.39 and 482.86

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Solution

The fourth proportional to 761.48, 1,140.39 and 482.86 is: 723.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.48 : 1,140.39 = 482.86 : x
  2. Step 2: Convert to fraction form
    761.48/1,140.39 = 482.86/x
  3. Step 3: Cross multiply
    761.48x = 1,140.39 × 482.86
  4. Step 4: Simplify right side
    761.48x = 550,644.05
  5. Step 5: Solve for x
    x = 550,644.05/761.48
  6. Step 6: Final answer
    x = 723.13

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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.