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Finding the Fourth Proportional to 1,312.96, 1,969.28 and 388.48

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Solution

The fourth proportional to 1,312.96, 1,969.28 and 388.48 is: 582.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.96 : 1,969.28 = 388.48 : x
  2. Step 2: Convert to fraction form
    1,312.96/1,969.28 = 388.48/x
  3. Step 3: Cross multiply
    1,312.96x = 1,969.28 × 388.48
  4. Step 4: Simplify right side
    1,312.96x = 765,025.89
  5. Step 5: Solve for x
    x = 765,025.89/1,312.96
  6. Step 6: Final answer
    x = 582.67

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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.