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Finding the Fourth Proportional to 28,612.78, 42,928.12 and 12,831.04

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Solution

The fourth proportional to 28,612.78, 42,928.12 and 12,831.04 is: 19,250.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.78 : 42,928.12 = 12,831.04 : x
  2. Step 2: Convert to fraction form
    28,612.78/42,928.12 = 12,831.04/x
  3. Step 3: Cross multiply
    28,612.78x = 42,928.12 × 12,831.04
  4. Step 4: Simplify right side
    28,612.78x = 550,812,424.84
  5. Step 5: Solve for x
    x = 550,812,424.84/28,612.78
  6. Step 6: Final answer
    x = 19,250.57

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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.