Home / 1,420.40-2,124.12-1,091.28

Finding the Fourth Proportional to 1,420.40, 2,124.12 and 1,091.28

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Solution

The fourth proportional to 1,420.40, 2,124.12 and 1,091.28 is: 1,631.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.40 : 2,124.12 = 1,091.28 : x
  2. Step 2: Convert to fraction form
    1,420.40/2,124.12 = 1,091.28/x
  3. Step 3: Cross multiply
    1,420.40x = 2,124.12 × 1,091.28
  4. Step 4: Simplify right side
    1,420.40x = 2,318,009.67
  5. Step 5: Solve for x
    x = 2,318,009.67/1,420.40
  6. Step 6: Final answer
    x = 1,631.94

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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.