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Finding the Fourth Proportional to 990.19, 1,366.50 and 570.63

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Solution

The fourth proportional to 990.19, 1,366.50 and 570.63 is: 787.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.19 : 1,366.50 = 570.63 : x
  2. Step 2: Convert to fraction form
    990.19/1,366.50 = 570.63/x
  3. Step 3: Cross multiply
    990.19x = 1,366.50 × 570.63
  4. Step 4: Simplify right side
    990.19x = 779,765.90
  5. Step 5: Solve for x
    x = 779,765.90/990.19
  6. Step 6: Final answer
    x = 787.49

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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.