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Finding the Fourth Proportional to 921.32, 1,271.50 and 626.60

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Solution

The fourth proportional to 921.32, 1,271.50 and 626.60 is: 864.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.32 : 1,271.50 = 626.60 : x
  2. Step 2: Convert to fraction form
    921.32/1,271.50 = 626.60/x
  3. Step 3: Cross multiply
    921.32x = 1,271.50 × 626.60
  4. Step 4: Simplify right side
    921.32x = 796,721.90
  5. Step 5: Solve for x
    x = 796,721.90/921.32
  6. Step 6: Final answer
    x = 864.76

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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.