Home / 1,397.43-1,927.79-999.18

Finding the Fourth Proportional to 1,397.43, 1,927.79 and 999.18

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Solution

The fourth proportional to 1,397.43, 1,927.79 and 999.18 is: 1,378.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.43 : 1,927.79 = 999.18 : x
  2. Step 2: Convert to fraction form
    1,397.43/1,927.79 = 999.18/x
  3. Step 3: Cross multiply
    1,397.43x = 1,927.79 × 999.18
  4. Step 4: Simplify right side
    1,397.43x = 1,926,204.22
  5. Step 5: Solve for x
    x = 1,926,204.22/1,397.43
  6. Step 6: Final answer
    x = 1,378.39

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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.