Home / 1,317.60-1,976.50-393.09

Finding the Fourth Proportional to 1,317.60, 1,976.50 and 393.09

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Solution

The fourth proportional to 1,317.60, 1,976.50 and 393.09 is: 589.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.60 : 1,976.50 = 393.09 : x
  2. Step 2: Convert to fraction form
    1,317.60/1,976.50 = 393.09/x
  3. Step 3: Cross multiply
    1,317.60x = 1,976.50 × 393.09
  4. Step 4: Simplify right side
    1,317.60x = 776,935.46
  5. Step 5: Solve for x
    x = 776,935.46/1,317.60
  6. Step 6: Final answer
    x = 589.66

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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.