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Finding the Fourth Proportional to 921.38, 1,271.79 and 816.83

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Solution

The fourth proportional to 921.38, 1,271.79 and 816.83 is: 1,127.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,271.79 = 816.83 : x
  2. Step 2: Convert to fraction form
    921.38/1,271.79 = 816.83/x
  3. Step 3: Cross multiply
    921.38x = 1,271.79 × 816.83
  4. Step 4: Simplify right side
    921.38x = 1,038,836.23
  5. Step 5: Solve for x
    x = 1,038,836.23/921.38
  6. Step 6: Final answer
    x = 1,127.48

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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.