Home / 1,317.28-1,975.73-392.80

Finding the Fourth Proportional to 1,317.28, 1,975.73 and 392.80

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Solution

The fourth proportional to 1,317.28, 1,975.73 and 392.80 is: 589.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.28 : 1,975.73 = 392.80 : x
  2. Step 2: Convert to fraction form
    1,317.28/1,975.73 = 392.80/x
  3. Step 3: Cross multiply
    1,317.28x = 1,975.73 × 392.80
  4. Step 4: Simplify right side
    1,317.28x = 776,054.90
  5. Step 5: Solve for x
    x = 776,054.90/1,317.28
  6. Step 6: Final answer
    x = 589.14

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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.