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Finding the Fourth Proportional to 1,225.17, 1,690.74 and 701.28

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Solution

The fourth proportional to 1,225.17, 1,690.74 and 701.28 is: 967.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.17 : 1,690.74 = 701.28 : x
  2. Step 2: Convert to fraction form
    1,225.17/1,690.74 = 701.28/x
  3. Step 3: Cross multiply
    1,225.17x = 1,690.74 × 701.28
  4. Step 4: Simplify right side
    1,225.17x = 1,185,682.15
  5. Step 5: Solve for x
    x = 1,185,682.15/1,225.17
  6. Step 6: Final answer
    x = 967.77

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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.