Home / 1,578.79-2,176.81-1,438.33

Finding the Fourth Proportional to 1,578.79, 2,176.81 and 1,438.33

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Solution

The fourth proportional to 1,578.79, 2,176.81 and 1,438.33 is: 1,983.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.79 : 2,176.81 = 1,438.33 : x
  2. Step 2: Convert to fraction form
    1,578.79/2,176.81 = 1,438.33/x
  3. Step 3: Cross multiply
    1,578.79x = 2,176.81 × 1,438.33
  4. Step 4: Simplify right side
    1,578.79x = 3,130,953.05
  5. Step 5: Solve for x
    x = 3,130,953.05/1,578.79
  6. Step 6: Final answer
    x = 1,983.13

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1.5x scale

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.