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Finding the Fourth Proportional to 30,831.61, 46,245.51 and 18,987.64

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Solution

The fourth proportional to 30,831.61, 46,245.51 and 18,987.64 is: 28,480.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,831.61 : 46,245.51 = 18,987.64 : x
  2. Step 2: Convert to fraction form
    30,831.61/46,245.51 = 18,987.64/x
  3. Step 3: Cross multiply
    30,831.61x = 46,245.51 × 18,987.64
  4. Step 4: Simplify right side
    30,831.61x = 878,093,095.50
  5. Step 5: Solve for x
    x = 878,093,095.50/30,831.61
  6. Step 6: Final answer
    x = 28,480.29

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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.