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Finding the Fourth Proportional to 1,225.23, 1,690.86 and 701.25

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Solution

The fourth proportional to 1,225.23, 1,690.86 and 701.25 is: 967.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.23 : 1,690.86 = 701.25 : x
  2. Step 2: Convert to fraction form
    1,225.23/1,690.86 = 701.25/x
  3. Step 3: Cross multiply
    1,225.23x = 1,690.86 × 701.25
  4. Step 4: Simplify right side
    1,225.23x = 1,185,715.58
  5. Step 5: Solve for x
    x = 1,185,715.58/1,225.23
  6. Step 6: Final answer
    x = 967.75

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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.