Home / 1,225.11-1,686.78-1,038.21

Finding the Fourth Proportional to 1,225.11, 1,686.78 and 1,038.21

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Solution

The fourth proportional to 1,225.11, 1,686.78 and 1,038.21 is: 1,429.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.11 : 1,686.78 = 1,038.21 : x
  2. Step 2: Convert to fraction form
    1,225.11/1,686.78 = 1,038.21/x
  3. Step 3: Cross multiply
    1,225.11x = 1,686.78 × 1,038.21
  4. Step 4: Simplify right side
    1,225.11x = 1,751,231.86
  5. Step 5: Solve for x
    x = 1,751,231.86/1,225.11
  6. Step 6: Final answer
    x = 1,429.45

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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.