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Finding the Fourth Proportional to 1,478.72, 2,040.60 and 815.60

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Solution

The fourth proportional to 1,478.72, 2,040.60 and 815.60 is: 1,125.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.72 : 2,040.60 = 815.60 : x
  2. Step 2: Convert to fraction form
    1,478.72/2,040.60 = 815.60/x
  3. Step 3: Cross multiply
    1,478.72x = 2,040.60 × 815.60
  4. Step 4: Simplify right side
    1,478.72x = 1,664,313.36
  5. Step 5: Solve for x
    x = 1,664,313.36/1,478.72
  6. Step 6: Final answer
    x = 1,125.51

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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.