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Finding the Fourth Proportional to 1,115.25, 1,539.14 and 649.59

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Solution

The fourth proportional to 1,115.25, 1,539.14 and 649.59 is: 896.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.25 : 1,539.14 = 649.59 : x
  2. Step 2: Convert to fraction form
    1,115.25/1,539.14 = 649.59/x
  3. Step 3: Cross multiply
    1,115.25x = 1,539.14 × 649.59
  4. Step 4: Simplify right side
    1,115.25x = 999,809.95
  5. Step 5: Solve for x
    x = 999,809.95/1,115.25
  6. Step 6: Final answer
    x = 896.49

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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.