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Finding the Fourth Proportional to 901.92, 1,245 and 665.46

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Solution

The fourth proportional to 901.92, 1,245 and 665.46 is: 918.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.92 : 1,245 = 665.46 : x
  2. Step 2: Convert to fraction form
    901.92/1,245 = 665.46/x
  3. Step 3: Cross multiply
    901.92x = 1,245 × 665.46
  4. Step 4: Simplify right side
    901.92x = 828,497.70
  5. Step 5: Solve for x
    x = 828,497.70/901.92
  6. Step 6: Final answer
    x = 918.59

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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.