Home / 1,392.13-1,921.26-802.86

Finding the Fourth Proportional to 1,392.13, 1,921.26 and 802.86

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Solution

The fourth proportional to 1,392.13, 1,921.26 and 802.86 is: 1,108.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.13 : 1,921.26 = 802.86 : x
  2. Step 2: Convert to fraction form
    1,392.13/1,921.26 = 802.86/x
  3. Step 3: Cross multiply
    1,392.13x = 1,921.26 × 802.86
  4. Step 4: Simplify right side
    1,392.13x = 1,542,502.80
  5. Step 5: Solve for x
    x = 1,542,502.80/1,392.13
  6. Step 6: Final answer
    x = 1,108.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.