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Finding the Fourth Proportional to 1,413.16, 2,119.74 and 439

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Solution

The fourth proportional to 1,413.16, 2,119.74 and 439 is: 658.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.16 : 2,119.74 = 439 : x
  2. Step 2: Convert to fraction form
    1,413.16/2,119.74 = 439/x
  3. Step 3: Cross multiply
    1,413.16x = 2,119.74 × 439
  4. Step 4: Simplify right side
    1,413.16x = 930,565.86
  5. Step 5: Solve for x
    x = 930,565.86/1,413.16
  6. Step 6: Final answer
    x = 658.50

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Double scale
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Similar ratio
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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.