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Finding the Fourth Proportional to 901.48, 1,243.94 and 665.55

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Solution

The fourth proportional to 901.48, 1,243.94 and 665.55 is: 918.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.48 : 1,243.94 = 665.55 : x
  2. Step 2: Convert to fraction form
    901.48/1,243.94 = 665.55/x
  3. Step 3: Cross multiply
    901.48x = 1,243.94 × 665.55
  4. Step 4: Simplify right side
    901.48x = 827,904.27
  5. Step 5: Solve for x
    x = 827,904.27/901.48
  6. Step 6: Final answer
    x = 918.39

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1.5x scale

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.