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Finding the Fourth Proportional to 926.27, 1,390.06 and 618.71

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Solution

The fourth proportional to 926.27, 1,390.06 and 618.71 is: 928.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.27 : 1,390.06 = 618.71 : x
  2. Step 2: Convert to fraction form
    926.27/1,390.06 = 618.71/x
  3. Step 3: Cross multiply
    926.27x = 1,390.06 × 618.71
  4. Step 4: Simplify right side
    926.27x = 860,037.85
  5. Step 5: Solve for x
    x = 860,037.85/926.27
  6. Step 6: Final answer
    x = 928.50

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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.