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Finding the Fourth Proportional to 990.09, 1,366.52 and 570.69

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Solution

The fourth proportional to 990.09, 1,366.52 and 570.69 is: 787.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.09 : 1,366.52 = 570.69 : x
  2. Step 2: Convert to fraction form
    990.09/1,366.52 = 570.69/x
  3. Step 3: Cross multiply
    990.09x = 1,366.52 × 570.69
  4. Step 4: Simplify right side
    990.09x = 779,856.45
  5. Step 5: Solve for x
    x = 779,856.45/990.09
  6. Step 6: Final answer
    x = 787.66

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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.