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Finding the Fourth Proportional to 761.86, 1,141.68 and 651.52

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Solution

The fourth proportional to 761.86, 1,141.68 and 651.52 is: 976.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.86 : 1,141.68 = 651.52 : x
  2. Step 2: Convert to fraction form
    761.86/1,141.68 = 651.52/x
  3. Step 3: Cross multiply
    761.86x = 1,141.68 × 651.52
  4. Step 4: Simplify right side
    761.86x = 743,827.35
  5. Step 5: Solve for x
    x = 743,827.35/761.86
  6. Step 6: Final answer
    x = 976.33

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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.