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Finding the Fourth Proportional to 1,315.75, 1,973.63 and 403.75

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Solution

The fourth proportional to 1,315.75, 1,973.63 and 403.75 is: 605.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.75 : 1,973.63 = 403.75 : x
  2. Step 2: Convert to fraction form
    1,315.75/1,973.63 = 403.75/x
  3. Step 3: Cross multiply
    1,315.75x = 1,973.63 × 403.75
  4. Step 4: Simplify right side
    1,315.75x = 796,853.11
  5. Step 5: Solve for x
    x = 796,853.11/1,315.75
  6. Step 6: Final answer
    x = 605.63

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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.