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Finding the Fourth Proportional to 1,698.23, 2,548.08 and 918.78

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Solution

The fourth proportional to 1,698.23, 2,548.08 and 918.78 is: 1,378.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.23 : 2,548.08 = 918.78 : x
  2. Step 2: Convert to fraction form
    1,698.23/2,548.08 = 918.78/x
  3. Step 3: Cross multiply
    1,698.23x = 2,548.08 × 918.78
  4. Step 4: Simplify right side
    1,698.23x = 2,341,124.94
  5. Step 5: Solve for x
    x = 2,341,124.94/1,698.23
  6. Step 6: Final answer
    x = 1,378.57

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1.5x scale

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.