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Finding the Fourth Proportional to 1,173.45, 1,619.36 and 642.35

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Solution

The fourth proportional to 1,173.45, 1,619.36 and 642.35 is: 886.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.45 : 1,619.36 = 642.35 : x
  2. Step 2: Convert to fraction form
    1,173.45/1,619.36 = 642.35/x
  3. Step 3: Cross multiply
    1,173.45x = 1,619.36 × 642.35
  4. Step 4: Simplify right side
    1,173.45x = 1,040,184.59
  5. Step 5: Solve for x
    x = 1,040,184.59/1,173.45
  6. Step 6: Final answer
    x = 886.43

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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.