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Finding the Fourth Proportional to 901.19, 1,243.55 and 665.26

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Solution

The fourth proportional to 901.19, 1,243.55 and 665.26 is: 917.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.19 : 1,243.55 = 665.26 : x
  2. Step 2: Convert to fraction form
    901.19/1,243.55 = 665.26/x
  3. Step 3: Cross multiply
    901.19x = 1,243.55 × 665.26
  4. Step 4: Simplify right side
    901.19x = 827,280.75
  5. Step 5: Solve for x
    x = 827,280.75/901.19
  6. Step 6: Final answer
    x = 917.99

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Double scale
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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.