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Finding the Fourth Proportional to 1,200.36, 1,800.54 and 715.58

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Solution

The fourth proportional to 1,200.36, 1,800.54 and 715.58 is: 1,073.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.36 : 1,800.54 = 715.58 : x
  2. Step 2: Convert to fraction form
    1,200.36/1,800.54 = 715.58/x
  3. Step 3: Cross multiply
    1,200.36x = 1,800.54 × 715.58
  4. Step 4: Simplify right side
    1,200.36x = 1,288,430.41
  5. Step 5: Solve for x
    x = 1,288,430.41/1,200.36
  6. Step 6: Final answer
    x = 1,073.37

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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.