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Finding the Fourth Proportional to 1,185.18, 1,777.95 and 415.50

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Solution

The fourth proportional to 1,185.18, 1,777.95 and 415.50 is: 623.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.18 : 1,777.95 = 415.50 : x
  2. Step 2: Convert to fraction form
    1,185.18/1,777.95 = 415.50/x
  3. Step 3: Cross multiply
    1,185.18x = 1,777.95 × 415.50
  4. Step 4: Simplify right side
    1,185.18x = 738,738.23
  5. Step 5: Solve for x
    x = 738,738.23/1,185.18
  6. Step 6: Final answer
    x = 623.31

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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.