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Finding the Fourth Proportional to 986.58, 1,359.99 and 654.28

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Solution

The fourth proportional to 986.58, 1,359.99 and 654.28 is: 901.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.58 : 1,359.99 = 654.28 : x
  2. Step 2: Convert to fraction form
    986.58/1,359.99 = 654.28/x
  3. Step 3: Cross multiply
    986.58x = 1,359.99 × 654.28
  4. Step 4: Simplify right side
    986.58x = 889,810.86
  5. Step 5: Solve for x
    x = 889,810.86/986.58
  6. Step 6: Final answer
    x = 901.91

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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.