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Finding the Fourth Proportional to 1,121.08, 1,681.77 and 340.99

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Solution

The fourth proportional to 1,121.08, 1,681.77 and 340.99 is: 511.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.08 : 1,681.77 = 340.99 : x
  2. Step 2: Convert to fraction form
    1,121.08/1,681.77 = 340.99/x
  3. Step 3: Cross multiply
    1,121.08x = 1,681.77 × 340.99
  4. Step 4: Simplify right side
    1,121.08x = 573,466.75
  5. Step 5: Solve for x
    x = 573,466.75/1,121.08
  6. Step 6: Final answer
    x = 511.53

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.