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Finding the Fourth Proportional to 1,245.76, 1,868.64 and 380.08

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Solution

The fourth proportional to 1,245.76, 1,868.64 and 380.08 is: 570.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.76 : 1,868.64 = 380.08 : x
  2. Step 2: Convert to fraction form
    1,245.76/1,868.64 = 380.08/x
  3. Step 3: Cross multiply
    1,245.76x = 1,868.64 × 380.08
  4. Step 4: Simplify right side
    1,245.76x = 710,232.69
  5. Step 5: Solve for x
    x = 710,232.69/1,245.76
  6. Step 6: Final answer
    x = 570.12

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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.