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Finding the Fourth Proportional to 18,871.54, 28,307.21 and 4,831.54

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Solution

The fourth proportional to 18,871.54, 28,307.21 and 4,831.54 is: 7,247.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.54 : 28,307.21 = 4,831.54 : x
  2. Step 2: Convert to fraction form
    18,871.54/28,307.21 = 4,831.54/x
  3. Step 3: Cross multiply
    18,871.54x = 28,307.21 × 4,831.54
  4. Step 4: Simplify right side
    18,871.54x = 136,767,322.48
  5. Step 5: Solve for x
    x = 136,767,322.48/18,871.54
  6. Step 6: Final answer
    x = 7,247.28

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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.