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Finding the Fourth Proportional to 1,225.32, 1,690.90 and 701.31

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Solution

The fourth proportional to 1,225.32, 1,690.90 and 701.31 is: 967.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.32 : 1,690.90 = 701.31 : x
  2. Step 2: Convert to fraction form
    1,225.32/1,690.90 = 701.31/x
  3. Step 3: Cross multiply
    1,225.32x = 1,690.90 × 701.31
  4. Step 4: Simplify right side
    1,225.32x = 1,185,845.08
  5. Step 5: Solve for x
    x = 1,185,845.08/1,225.32
  6. Step 6: Final answer
    x = 967.78

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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.