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Finding the Fourth Proportional to 889.38, 1,227.90 and 666.54

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Solution

The fourth proportional to 889.38, 1,227.90 and 666.54 is: 920.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.38 : 1,227.90 = 666.54 : x
  2. Step 2: Convert to fraction form
    889.38/1,227.90 = 666.54/x
  3. Step 3: Cross multiply
    889.38x = 1,227.90 × 666.54
  4. Step 4: Simplify right side
    889.38x = 818,444.47
  5. Step 5: Solve for x
    x = 818,444.47/889.38
  6. Step 6: Final answer
    x = 920.24

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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.