Home / 1,317.12-1,975.95-392.64

Finding the Fourth Proportional to 1,317.12, 1,975.95 and 392.64

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Solution

The fourth proportional to 1,317.12, 1,975.95 and 392.64 is: 589.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.12 : 1,975.95 = 392.64 : x
  2. Step 2: Convert to fraction form
    1,317.12/1,975.95 = 392.64/x
  3. Step 3: Cross multiply
    1,317.12x = 1,975.95 × 392.64
  4. Step 4: Simplify right side
    1,317.12x = 775,837.01
  5. Step 5: Solve for x
    x = 775,837.01/1,317.12
  6. Step 6: Final answer
    x = 589.04

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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.