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Finding the Fourth Proportional to 989.95, 1,366.27 and 570.22

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Solution

The fourth proportional to 989.95, 1,366.27 and 570.22 is: 786.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.95 : 1,366.27 = 570.22 : x
  2. Step 2: Convert to fraction form
    989.95/1,366.27 = 570.22/x
  3. Step 3: Cross multiply
    989.95x = 1,366.27 × 570.22
  4. Step 4: Simplify right side
    989.95x = 779,074.77
  5. Step 5: Solve for x
    x = 779,074.77/989.95
  6. Step 6: Final answer
    x = 786.99

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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.