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Finding the Fourth Proportional to 1,113.78, 1,537.14 and 648

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Solution

The fourth proportional to 1,113.78, 1,537.14 and 648 is: 894.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.78 : 1,537.14 = 648 : x
  2. Step 2: Convert to fraction form
    1,113.78/1,537.14 = 648/x
  3. Step 3: Cross multiply
    1,113.78x = 1,537.14 × 648
  4. Step 4: Simplify right side
    1,113.78x = 996,066.72
  5. Step 5: Solve for x
    x = 996,066.72/1,113.78
  6. Step 6: Final answer
    x = 894.31

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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.