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Finding the Fourth Proportional to 1,225.09, 1,690.54 and 701.12

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Solution

The fourth proportional to 1,225.09, 1,690.54 and 701.12 is: 967.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.09 : 1,690.54 = 701.12 : x
  2. Step 2: Convert to fraction form
    1,225.09/1,690.54 = 701.12/x
  3. Step 3: Cross multiply
    1,225.09x = 1,690.54 × 701.12
  4. Step 4: Simplify right side
    1,225.09x = 1,185,271.40
  5. Step 5: Solve for x
    x = 1,185,271.40/1,225.09
  6. Step 6: Final answer
    x = 967.50

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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.