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Finding the Fourth Proportional to 281,330.64, 421,859.80 and 103,921.20

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Solution

The fourth proportional to 281,330.64, 421,859.80 and 103,921.20 is: 155,831.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,330.64 : 421,859.80 = 103,921.20 : x
  2. Step 2: Convert to fraction form
    281,330.64/421,859.80 = 103,921.20/x
  3. Step 3: Cross multiply
    281,330.64x = 421,859.80 × 103,921.20
  4. Step 4: Simplify right side
    281,330.64x = 43,840,176,647.76
  5. Step 5: Solve for x
    x = 43,840,176,647.76/281,330.64
  6. Step 6: Final answer
    x = 155,831.50

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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.