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Finding the Fourth Proportional to 1,698.50, 2,547.75 and 672.50

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Solution

The fourth proportional to 1,698.50, 2,547.75 and 672.50 is: 1,008.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.50 : 2,547.75 = 672.50 : x
  2. Step 2: Convert to fraction form
    1,698.50/2,547.75 = 672.50/x
  3. Step 3: Cross multiply
    1,698.50x = 2,547.75 × 672.50
  4. Step 4: Simplify right side
    1,698.50x = 1,713,361.88
  5. Step 5: Solve for x
    x = 1,713,361.88/1,698.50
  6. Step 6: Final answer
    x = 1,008.75

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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.