Home / 1,478.30-2,039.99-815.13

Finding the Fourth Proportional to 1,478.30, 2,039.99 and 815.13

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Solution

The fourth proportional to 1,478.30, 2,039.99 and 815.13 is: 1,124.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.30 : 2,039.99 = 815.13 : x
  2. Step 2: Convert to fraction form
    1,478.30/2,039.99 = 815.13/x
  3. Step 3: Cross multiply
    1,478.30x = 2,039.99 × 815.13
  4. Step 4: Simplify right side
    1,478.30x = 1,662,852.97
  5. Step 5: Solve for x
    x = 1,662,852.97/1,478.30
  6. Step 6: Final answer
    x = 1,124.85

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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.