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Finding the Fourth Proportional to 926.45, 1,389.36 and 378.48

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Solution

The fourth proportional to 926.45, 1,389.36 and 378.48 is: 567.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.45 : 1,389.36 = 378.48 : x
  2. Step 2: Convert to fraction form
    926.45/1,389.36 = 378.48/x
  3. Step 3: Cross multiply
    926.45x = 1,389.36 × 378.48
  4. Step 4: Simplify right side
    926.45x = 525,851.60
  5. Step 5: Solve for x
    x = 525,851.60/926.45
  6. Step 6: Final answer
    x = 567.60

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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.