Home / 1,420.40-1,961.16-1,029.20

Finding the Fourth Proportional to 1,420.40, 1,961.16 and 1,029.20

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Solution

The fourth proportional to 1,420.40, 1,961.16 and 1,029.20 is: 1,421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.40 : 1,961.16 = 1,029.20 : x
  2. Step 2: Convert to fraction form
    1,420.40/1,961.16 = 1,029.20/x
  3. Step 3: Cross multiply
    1,420.40x = 1,961.16 × 1,029.20
  4. Step 4: Simplify right side
    1,420.40x = 2,018,425.87
  5. Step 5: Solve for x
    x = 2,018,425.87/1,420.40
  6. Step 6: Final answer
    x = 1,421.03

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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.