Home / 1,226.12-1,688.16-1,039.20

Finding the Fourth Proportional to 1,226.12, 1,688.16 and 1,039.20

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Solution

The fourth proportional to 1,226.12, 1,688.16 and 1,039.20 is: 1,430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.12 : 1,688.16 = 1,039.20 : x
  2. Step 2: Convert to fraction form
    1,226.12/1,688.16 = 1,039.20/x
  3. Step 3: Cross multiply
    1,226.12x = 1,688.16 × 1,039.20
  4. Step 4: Simplify right side
    1,226.12x = 1,754,335.87
  5. Step 5: Solve for x
    x = 1,754,335.87/1,226.12
  6. Step 6: Final answer
    x = 1,430.80

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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.