Home / 1,317.16-1,976.08-392.72

Finding the Fourth Proportional to 1,317.16, 1,976.08 and 392.72

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Solution

The fourth proportional to 1,317.16, 1,976.08 and 392.72 is: 589.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.16 : 1,976.08 = 392.72 : x
  2. Step 2: Convert to fraction form
    1,317.16/1,976.08 = 392.72/x
  3. Step 3: Cross multiply
    1,317.16x = 1,976.08 × 392.72
  4. Step 4: Simplify right side
    1,317.16x = 776,037.24
  5. Step 5: Solve for x
    x = 776,037.24/1,317.16
  6. Step 6: Final answer
    x = 589.18

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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.