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Finding the Fourth Proportional to 921.34, 1,269.66 and 764.20

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Solution

The fourth proportional to 921.34, 1,269.66 and 764.20 is: 1,053.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.34 : 1,269.66 = 764.20 : x
  2. Step 2: Convert to fraction form
    921.34/1,269.66 = 764.20/x
  3. Step 3: Cross multiply
    921.34x = 1,269.66 × 764.20
  4. Step 4: Simplify right side
    921.34x = 970,271.00
  5. Step 5: Solve for x
    x = 970,271.00/921.34
  6. Step 6: Final answer
    x = 1,053.11

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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.