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Finding the Fourth Proportional to 1,571.02, 2,355.60 and 920.38

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Solution

The fourth proportional to 1,571.02, 2,355.60 and 920.38 is: 1,380.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.02 : 2,355.60 = 920.38 : x
  2. Step 2: Convert to fraction form
    1,571.02/2,355.60 = 920.38/x
  3. Step 3: Cross multiply
    1,571.02x = 2,355.60 × 920.38
  4. Step 4: Simplify right side
    1,571.02x = 2,168,047.13
  5. Step 5: Solve for x
    x = 2,168,047.13/1,571.02
  6. Step 6: Final answer
    x = 1,380.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.