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Finding the Fourth Proportional to 926.56, 1,389.80 and 620.60

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Solution

The fourth proportional to 926.56, 1,389.80 and 620.60 is: 930.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.56 : 1,389.80 = 620.60 : x
  2. Step 2: Convert to fraction form
    926.56/1,389.80 = 620.60/x
  3. Step 3: Cross multiply
    926.56x = 1,389.80 × 620.60
  4. Step 4: Simplify right side
    926.56x = 862,509.88
  5. Step 5: Solve for x
    x = 862,509.88/926.56
  6. Step 6: Final answer
    x = 930.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.