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Finding the Fourth Proportional to 1,079.94, 1,490.38 and 607.79

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Solution

The fourth proportional to 1,079.94, 1,490.38 and 607.79 is: 838.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.94 : 1,490.38 = 607.79 : x
  2. Step 2: Convert to fraction form
    1,079.94/1,490.38 = 607.79/x
  3. Step 3: Cross multiply
    1,079.94x = 1,490.38 × 607.79
  4. Step 4: Simplify right side
    1,079.94x = 905,840.35
  5. Step 5: Solve for x
    x = 905,840.35/1,079.94
  6. Step 6: Final answer
    x = 838.79

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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.