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Finding the Fourth Proportional to 1,246.91, 1,721.57 and 775.51

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Solution

The fourth proportional to 1,246.91, 1,721.57 and 775.51 is: 1,070.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.91 : 1,721.57 = 775.51 : x
  2. Step 2: Convert to fraction form
    1,246.91/1,721.57 = 775.51/x
  3. Step 3: Cross multiply
    1,246.91x = 1,721.57 × 775.51
  4. Step 4: Simplify right side
    1,246.91x = 1,335,094.75
  5. Step 5: Solve for x
    x = 1,335,094.75/1,246.91
  6. Step 6: Final answer
    x = 1,070.72

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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.