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Finding the Fourth Proportional to 1,315.63, 1,815.37 and 874.18

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Solution

The fourth proportional to 1,315.63, 1,815.37 and 874.18 is: 1,206.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.63 : 1,815.37 = 874.18 : x
  2. Step 2: Convert to fraction form
    1,315.63/1,815.37 = 874.18/x
  3. Step 3: Cross multiply
    1,315.63x = 1,815.37 × 874.18
  4. Step 4: Simplify right side
    1,315.63x = 1,586,960.15
  5. Step 5: Solve for x
    x = 1,586,960.15/1,315.63
  6. Step 6: Final answer
    x = 1,206.24

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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.