Home / 1,458.16-2,012.30-820.20

Finding the Fourth Proportional to 1,458.16, 2,012.30 and 820.20

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Solution

The fourth proportional to 1,458.16, 2,012.30 and 820.20 is: 1,131.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.16 : 2,012.30 = 820.20 : x
  2. Step 2: Convert to fraction form
    1,458.16/2,012.30 = 820.20/x
  3. Step 3: Cross multiply
    1,458.16x = 2,012.30 × 820.20
  4. Step 4: Simplify right side
    1,458.16x = 1,650,490.51
  5. Step 5: Solve for x
    x = 1,650,490.51/1,458.16
  6. Step 6: Final answer
    x = 1,131.90

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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.