Home / 1,393.20-1,918.49-999.54

Finding the Fourth Proportional to 1,393.20, 1,918.49 and 999.54

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Solution

The fourth proportional to 1,393.20, 1,918.49 and 999.54 is: 1,376.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.20 : 1,918.49 = 999.54 : x
  2. Step 2: Convert to fraction form
    1,393.20/1,918.49 = 999.54/x
  3. Step 3: Cross multiply
    1,393.20x = 1,918.49 × 999.54
  4. Step 4: Simplify right side
    1,393.20x = 1,917,602.50
  5. Step 5: Solve for x
    x = 1,917,602.50/1,393.20
  6. Step 6: Final answer
    x = 1,376.40

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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.