Home / 1,478.45-2,040.28-815.33

Finding the Fourth Proportional to 1,478.45, 2,040.28 and 815.33

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Solution

The fourth proportional to 1,478.45, 2,040.28 and 815.33 is: 1,125.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.45 : 2,040.28 = 815.33 : x
  2. Step 2: Convert to fraction form
    1,478.45/2,040.28 = 815.33/x
  3. Step 3: Cross multiply
    1,478.45x = 2,040.28 × 815.33
  4. Step 4: Simplify right side
    1,478.45x = 1,663,490.78
  5. Step 5: Solve for x
    x = 1,663,490.78/1,478.45
  6. Step 6: Final answer
    x = 1,125.16

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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.