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Finding the Fourth Proportional to 70,522.72, 105,783.36 and 21,274.72

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Solution

The fourth proportional to 70,522.72, 105,783.36 and 21,274.72 is: 31,911.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,522.72 : 105,783.36 = 21,274.72 : x
  2. Step 2: Convert to fraction form
    70,522.72/105,783.36 = 21,274.72/x
  3. Step 3: Cross multiply
    70,522.72x = 105,783.36 × 21,274.72
  4. Step 4: Simplify right side
    70,522.72x = 2,250,511,364.66
  5. Step 5: Solve for x
    x = 2,250,511,364.66/70,522.72
  6. Step 6: Final answer
    x = 31,911.86

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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.