Home / 1,478.55-2,040.23-815.36

Finding the Fourth Proportional to 1,478.55, 2,040.23 and 815.36

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Solution

The fourth proportional to 1,478.55, 2,040.23 and 815.36 is: 1,125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.55 : 2,040.23 = 815.36 : x
  2. Step 2: Convert to fraction form
    1,478.55/2,040.23 = 815.36/x
  3. Step 3: Cross multiply
    1,478.55x = 2,040.23 × 815.36
  4. Step 4: Simplify right side
    1,478.55x = 1,663,511.73
  5. Step 5: Solve for x
    x = 1,663,511.73/1,478.55
  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.