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Finding the Fourth Proportional to 1,185.50, 1,636.40 and 719.75

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Solution

The fourth proportional to 1,185.50, 1,636.40 and 719.75 is: 993.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.50 : 1,636.40 = 719.75 : x
  2. Step 2: Convert to fraction form
    1,185.50/1,636.40 = 719.75/x
  3. Step 3: Cross multiply
    1,185.50x = 1,636.40 × 719.75
  4. Step 4: Simplify right side
    1,185.50x = 1,177,798.90
  5. Step 5: Solve for x
    x = 1,177,798.90/1,185.50
  6. Step 6: Final answer
    x = 993.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.