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Finding the Fourth Proportional to 926.21, 1,389.31 and 618.66

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Solution

The fourth proportional to 926.21, 1,389.31 and 618.66 is: 927.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.21 : 1,389.31 = 618.66 : x
  2. Step 2: Convert to fraction form
    926.21/1,389.31 = 618.66/x
  3. Step 3: Cross multiply
    926.21x = 1,389.31 × 618.66
  4. Step 4: Simplify right side
    926.21x = 859,508.98
  5. Step 5: Solve for x
    x = 859,508.98/926.21
  6. Step 6: Final answer
    x = 927.98

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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.