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Finding the Fourth Proportional to 989.93, 1,366.16 and 570.28

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Solution

The fourth proportional to 989.93, 1,366.16 and 570.28 is: 787.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.93 : 1,366.16 = 570.28 : x
  2. Step 2: Convert to fraction form
    989.93/1,366.16 = 570.28/x
  3. Step 3: Cross multiply
    989.93x = 1,366.16 × 570.28
  4. Step 4: Simplify right side
    989.93x = 779,093.72
  5. Step 5: Solve for x
    x = 779,093.72/989.93
  6. Step 6: Final answer
    x = 787.02

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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.