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Finding the Fourth Proportional to 989.66, 1,365.83 and 570.03

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Solution

The fourth proportional to 989.66, 1,365.83 and 570.03 is: 786.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.66 : 1,365.83 = 570.03 : x
  2. Step 2: Convert to fraction form
    989.66/1,365.83 = 570.03/x
  3. Step 3: Cross multiply
    989.66x = 1,365.83 × 570.03
  4. Step 4: Simplify right side
    989.66x = 778,564.07
  5. Step 5: Solve for x
    x = 778,564.07/989.66
  6. Step 6: Final answer
    x = 786.70

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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.