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Finding the Fourth Proportional to 922.31, 1,273.35 and 685.98

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Solution

The fourth proportional to 922.31, 1,273.35 and 685.98 is: 947.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.31 : 1,273.35 = 685.98 : x
  2. Step 2: Convert to fraction form
    922.31/1,273.35 = 685.98/x
  3. Step 3: Cross multiply
    922.31x = 1,273.35 × 685.98
  4. Step 4: Simplify right side
    922.31x = 873,492.63
  5. Step 5: Solve for x
    x = 873,492.63/922.31
  6. Step 6: Final answer
    x = 947.08

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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.