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Finding the Fourth Proportional to 989.80, 1,365.86 and 570.08

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Solution

The fourth proportional to 989.80, 1,365.86 and 570.08 is: 786.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.80 : 1,365.86 = 570.08 : x
  2. Step 2: Convert to fraction form
    989.80/1,365.86 = 570.08/x
  3. Step 3: Cross multiply
    989.80x = 1,365.86 × 570.08
  4. Step 4: Simplify right side
    989.80x = 778,654.31
  5. Step 5: Solve for x
    x = 778,654.31/989.80
  6. Step 6: Final answer
    x = 786.68

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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.