Home / 1,478.33-2,040.21-815.24

Finding the Fourth Proportional to 1,478.33, 2,040.21 and 815.24

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Solution

The fourth proportional to 1,478.33, 2,040.21 and 815.24 is: 1,125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.33 : 2,040.21 = 815.24 : x
  2. Step 2: Convert to fraction form
    1,478.33/2,040.21 = 815.24/x
  3. Step 3: Cross multiply
    1,478.33x = 2,040.21 × 815.24
  4. Step 4: Simplify right side
    1,478.33x = 1,663,260.80
  5. Step 5: Solve for x
    x = 1,663,260.80/1,478.33
  6. Step 6: Final answer
    x = 1,125.10

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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.