Home / 1,289.30-1,781.44-1,148.18

Finding the Fourth Proportional to 1,289.30, 1,781.44 and 1,148.18

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Solution

The fourth proportional to 1,289.30, 1,781.44 and 1,148.18 is: 1,586.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.30 : 1,781.44 = 1,148.18 : x
  2. Step 2: Convert to fraction form
    1,289.30/1,781.44 = 1,148.18/x
  3. Step 3: Cross multiply
    1,289.30x = 1,781.44 × 1,148.18
  4. Step 4: Simplify right side
    1,289.30x = 2,045,413.78
  5. Step 5: Solve for x
    x = 2,045,413.78/1,289.30
  6. Step 6: Final answer
    x = 1,586.45

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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.