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Finding the Fourth Proportional to 1,111.92, 1,534.38 and 657.68

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Solution

The fourth proportional to 1,111.92, 1,534.38 and 657.68 is: 907.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.92 : 1,534.38 = 657.68 : x
  2. Step 2: Convert to fraction form
    1,111.92/1,534.38 = 657.68/x
  3. Step 3: Cross multiply
    1,111.92x = 1,534.38 × 657.68
  4. Step 4: Simplify right side
    1,111.92x = 1,009,131.04
  5. Step 5: Solve for x
    x = 1,009,131.04/1,111.92
  6. Step 6: Final answer
    x = 907.56

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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.