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Finding the Fourth Proportional to 1,128.15, 1,556.42 and 662.13

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Solution

The fourth proportional to 1,128.15, 1,556.42 and 662.13 is: 913.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.15 : 1,556.42 = 662.13 : x
  2. Step 2: Convert to fraction form
    1,128.15/1,556.42 = 662.13/x
  3. Step 3: Cross multiply
    1,128.15x = 1,556.42 × 662.13
  4. Step 4: Simplify right side
    1,128.15x = 1,030,549.06
  5. Step 5: Solve for x
    x = 1,030,549.06/1,128.15
  6. Step 6: Final answer
    x = 913.49

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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.