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Finding the Fourth Proportional to 990.55, 1,366.62 and 570.89

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Solution

The fourth proportional to 990.55, 1,366.62 and 570.89 is: 787.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.55 : 1,366.62 = 570.89 : x
  2. Step 2: Convert to fraction form
    990.55/1,366.62 = 570.89/x
  3. Step 3: Cross multiply
    990.55x = 1,366.62 × 570.89
  4. Step 4: Simplify right side
    990.55x = 780,189.41
  5. Step 5: Solve for x
    x = 780,189.41/990.55
  6. Step 6: Final answer
    x = 787.63

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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.