Home / 1,338.23-2,005.65-515.40

Finding the Fourth Proportional to 1,338.23, 2,005.65 and 515.40

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Solution

The fourth proportional to 1,338.23, 2,005.65 and 515.40 is: 772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.23 : 2,005.65 = 515.40 : x
  2. Step 2: Convert to fraction form
    1,338.23/2,005.65 = 515.40/x
  3. Step 3: Cross multiply
    1,338.23x = 2,005.65 × 515.40
  4. Step 4: Simplify right side
    1,338.23x = 1,033,712.01
  5. Step 5: Solve for x
    x = 1,033,712.01/1,338.23
  6. Step 6: Final answer
    x = 772.45

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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.