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Finding the Fourth Proportional to 1,287.37, 1,930.98 and 465.55

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Solution

The fourth proportional to 1,287.37, 1,930.98 and 465.55 is: 698.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.37 : 1,930.98 = 465.55 : x
  2. Step 2: Convert to fraction form
    1,287.37/1,930.98 = 465.55/x
  3. Step 3: Cross multiply
    1,287.37x = 1,930.98 × 465.55
  4. Step 4: Simplify right side
    1,287.37x = 898,967.74
  5. Step 5: Solve for x
    x = 898,967.74/1,287.37
  6. Step 6: Final answer
    x = 698.30

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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.