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Finding the Fourth Proportional to 990.37, 1,366.76 and 570.79

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Solution

The fourth proportional to 990.37, 1,366.76 and 570.79 is: 787.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.37 : 1,366.76 = 570.79 : x
  2. Step 2: Convert to fraction form
    990.37/1,366.76 = 570.79/x
  3. Step 3: Cross multiply
    990.37x = 1,366.76 × 570.79
  4. Step 4: Simplify right side
    990.37x = 780,132.94
  5. Step 5: Solve for x
    x = 780,132.94/990.37
  6. Step 6: Final answer
    x = 787.72

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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.