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Finding the Fourth Proportional to 990.58, 1,366.92 and 570.90

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Solution

The fourth proportional to 990.58, 1,366.92 and 570.90 is: 787.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.58 : 1,366.92 = 570.90 : x
  2. Step 2: Convert to fraction form
    990.58/1,366.92 = 570.90/x
  3. Step 3: Cross multiply
    990.58x = 1,366.92 × 570.90
  4. Step 4: Simplify right side
    990.58x = 780,374.63
  5. Step 5: Solve for x
    x = 780,374.63/990.58
  6. Step 6: Final answer
    x = 787.80

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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.