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Finding the Fourth Proportional to 926.58, 1,278.60 and 690.50

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Solution

The fourth proportional to 926.58, 1,278.60 and 690.50 is: 952.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.58 : 1,278.60 = 690.50 : x
  2. Step 2: Convert to fraction form
    926.58/1,278.60 = 690.50/x
  3. Step 3: Cross multiply
    926.58x = 1,278.60 × 690.50
  4. Step 4: Simplify right side
    926.58x = 882,873.30
  5. Step 5: Solve for x
    x = 882,873.30/926.58
  6. Step 6: Final answer
    x = 952.83

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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.