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Finding the Fourth Proportional to 986.81, 1,479.93 and 293.51

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Solution

The fourth proportional to 986.81, 1,479.93 and 293.51 is: 440.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.81 : 1,479.93 = 293.51 : x
  2. Step 2: Convert to fraction form
    986.81/1,479.93 = 293.51/x
  3. Step 3: Cross multiply
    986.81x = 1,479.93 × 293.51
  4. Step 4: Simplify right side
    986.81x = 434,366.85
  5. Step 5: Solve for x
    x = 434,366.85/986.81
  6. Step 6: Final answer
    x = 440.17

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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.