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Finding the Fourth Proportional to 761.91, 1,050.48 and 621.89

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Solution

The fourth proportional to 761.91, 1,050.48 and 621.89 is: 857.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.91 : 1,050.48 = 621.89 : x
  2. Step 2: Convert to fraction form
    761.91/1,050.48 = 621.89/x
  3. Step 3: Cross multiply
    761.91x = 1,050.48 × 621.89
  4. Step 4: Simplify right side
    761.91x = 653,277.75
  5. Step 5: Solve for x
    x = 653,277.75/761.91
  6. Step 6: Final answer
    x = 857.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.