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Finding the Fourth Proportional to 28,138.84, 38,831.12 and 15,563.58

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Solution

The fourth proportional to 28,138.84, 38,831.12 and 15,563.58 is: 21,477.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.84 : 38,831.12 = 15,563.58 : x
  2. Step 2: Convert to fraction form
    28,138.84/38,831.12 = 15,563.58/x
  3. Step 3: Cross multiply
    28,138.84x = 38,831.12 × 15,563.58
  4. Step 4: Simplify right side
    28,138.84x = 604,351,242.61
  5. Step 5: Solve for x
    x = 604,351,242.61/28,138.84
  6. Step 6: Final answer
    x = 21,477.48

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.