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Finding the Fourth Proportional to 990.26, 1,366.40 and 570.48

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Solution

The fourth proportional to 990.26, 1,366.40 and 570.48 is: 787.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.26 : 1,366.40 = 570.48 : x
  2. Step 2: Convert to fraction form
    990.26/1,366.40 = 570.48/x
  3. Step 3: Cross multiply
    990.26x = 1,366.40 × 570.48
  4. Step 4: Simplify right side
    990.26x = 779,503.87
  5. Step 5: Solve for x
    x = 779,503.87/990.26
  6. Step 6: Final answer
    x = 787.17

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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.