Home / 1,231.23-1,697.79-915.99

Finding the Fourth Proportional to 1,231.23, 1,697.79 and 915.99

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Solution

The fourth proportional to 1,231.23, 1,697.79 and 915.99 is: 1,263.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.23 : 1,697.79 = 915.99 : x
  2. Step 2: Convert to fraction form
    1,231.23/1,697.79 = 915.99/x
  3. Step 3: Cross multiply
    1,231.23x = 1,697.79 × 915.99
  4. Step 4: Simplify right side
    1,231.23x = 1,555,158.66
  5. Step 5: Solve for x
    x = 1,555,158.66/1,231.23
  6. Step 6: Final answer
    x = 1,263.09

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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.