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Finding the Fourth Proportional to 990.38, 1,366.65 and 570.71

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Solution

The fourth proportional to 990.38, 1,366.65 and 570.71 is: 787.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.38 : 1,366.65 = 570.71 : x
  2. Step 2: Convert to fraction form
    990.38/1,366.65 = 570.71/x
  3. Step 3: Cross multiply
    990.38x = 1,366.65 × 570.71
  4. Step 4: Simplify right side
    990.38x = 779,956.87
  5. Step 5: Solve for x
    x = 779,956.87/990.38
  6. Step 6: Final answer
    x = 787.54

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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.