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Finding the Fourth Proportional to 761.76, 1,050.30 and 669.42

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Solution

The fourth proportional to 761.76, 1,050.30 and 669.42 is: 922.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.76 : 1,050.30 = 669.42 : x
  2. Step 2: Convert to fraction form
    761.76/1,050.30 = 669.42/x
  3. Step 3: Cross multiply
    761.76x = 1,050.30 × 669.42
  4. Step 4: Simplify right side
    761.76x = 703,091.83
  5. Step 5: Solve for x
    x = 703,091.83/761.76
  6. Step 6: Final answer
    x = 922.98

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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.