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Finding the Fourth Proportional to 1,478.51, 2,040.36 and 815.39

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Solution

The fourth proportional to 1,478.51, 2,040.36 and 815.39 is: 1,125.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.51 : 2,040.36 = 815.39 : x
  2. Step 2: Convert to fraction form
    1,478.51/2,040.36 = 815.39/x
  3. Step 3: Cross multiply
    1,478.51x = 2,040.36 × 815.39
  4. Step 4: Simplify right side
    1,478.51x = 1,663,675.88
  5. Step 5: Solve for x
    x = 1,663,675.88/1,478.51
  6. Step 6: Final answer
    x = 1,125.24

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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.