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Finding the Fourth Proportional to 1,131.12, 1,561.14 and 665.46

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Solution

The fourth proportional to 1,131.12, 1,561.14 and 665.46 is: 918.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.12 : 1,561.14 = 665.46 : x
  2. Step 2: Convert to fraction form
    1,131.12/1,561.14 = 665.46/x
  3. Step 3: Cross multiply
    1,131.12x = 1,561.14 × 665.46
  4. Step 4: Simplify right side
    1,131.12x = 1,038,876.22
  5. Step 5: Solve for x
    x = 1,038,876.22/1,131.12
  6. Step 6: Final answer
    x = 918.45

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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.