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Finding the Fourth Proportional to 921.98, 1,272.20 and 657.11

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Solution

The fourth proportional to 921.98, 1,272.20 and 657.11 is: 906.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.98 : 1,272.20 = 657.11 : x
  2. Step 2: Convert to fraction form
    921.98/1,272.20 = 657.11/x
  3. Step 3: Cross multiply
    921.98x = 1,272.20 × 657.11
  4. Step 4: Simplify right side
    921.98x = 835,975.34
  5. Step 5: Solve for x
    x = 835,975.34/921.98
  6. Step 6: Final answer
    x = 906.72

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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.