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Finding the Fourth Proportional to 1,225.42, 1,690.63 and 701.15

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Solution

The fourth proportional to 1,225.42, 1,690.63 and 701.15 is: 967.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.42 : 1,690.63 = 701.15 : x
  2. Step 2: Convert to fraction form
    1,225.42/1,690.63 = 701.15/x
  3. Step 3: Cross multiply
    1,225.42x = 1,690.63 × 701.15
  4. Step 4: Simplify right side
    1,225.42x = 1,185,375.02
  5. Step 5: Solve for x
    x = 1,185,375.02/1,225.42
  6. Step 6: Final answer
    x = 967.32

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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.