Home / 2,155.40-2,974.37-1,317.51

Finding the Fourth Proportional to 2,155.40, 2,974.37 and 1,317.51

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Solution

The fourth proportional to 2,155.40, 2,974.37 and 1,317.51 is: 1,818.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.40 : 2,974.37 = 1,317.51 : x
  2. Step 2: Convert to fraction form
    2,155.40/2,974.37 = 1,317.51/x
  3. Step 3: Cross multiply
    2,155.40x = 2,974.37 × 1,317.51
  4. Step 4: Simplify right side
    2,155.40x = 3,918,762.22
  5. Step 5: Solve for x
    x = 3,918,762.22/2,155.40
  6. Step 6: Final answer
    x = 1,818.11

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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.