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Finding the Fourth Proportional to 1,200.07, 1,800.40 and 378.27

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Solution

The fourth proportional to 1,200.07, 1,800.40 and 378.27 is: 567.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.07 : 1,800.40 = 378.27 : x
  2. Step 2: Convert to fraction form
    1,200.07/1,800.40 = 378.27/x
  3. Step 3: Cross multiply
    1,200.07x = 1,800.40 × 378.27
  4. Step 4: Simplify right side
    1,200.07x = 681,038.14
  5. Step 5: Solve for x
    x = 681,038.14/1,200.07
  6. Step 6: Final answer
    x = 567.50

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1.5x scale

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.