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Finding the Fourth Proportional to 989.71, 1,365.86 and 570.17

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Solution

The fourth proportional to 989.71, 1,365.86 and 570.17 is: 786.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.71 : 1,365.86 = 570.17 : x
  2. Step 2: Convert to fraction form
    989.71/1,365.86 = 570.17/x
  3. Step 3: Cross multiply
    989.71x = 1,365.86 × 570.17
  4. Step 4: Simplify right side
    989.71x = 778,772.40
  5. Step 5: Solve for x
    x = 778,772.40/989.71
  6. Step 6: Final answer
    x = 786.87

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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.