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Finding the Fourth Proportional to 1,315.91, 1,973.88 and 342.02

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Solution

The fourth proportional to 1,315.91, 1,973.88 and 342.02 is: 513.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.91 : 1,973.88 = 342.02 : x
  2. Step 2: Convert to fraction form
    1,315.91/1,973.88 = 342.02/x
  3. Step 3: Cross multiply
    1,315.91x = 1,973.88 × 342.02
  4. Step 4: Simplify right side
    1,315.91x = 675,106.44
  5. Step 5: Solve for x
    x = 675,106.44/1,315.91
  6. Step 6: Final answer
    x = 513.03

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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.