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Finding the Fourth Proportional to 70,490.72, 105,788.63 and 28,371.20

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Solution

The fourth proportional to 70,490.72, 105,788.63 and 28,371.20 is: 42,577.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,490.72 : 105,788.63 = 28,371.20 : x
  2. Step 2: Convert to fraction form
    70,490.72/105,788.63 = 28,371.20/x
  3. Step 3: Cross multiply
    70,490.72x = 105,788.63 × 28,371.20
  4. Step 4: Simplify right side
    70,490.72x = 3,001,349,921.44
  5. Step 5: Solve for x
    x = 3,001,349,921.44/70,490.72
  6. Step 6: Final answer
    x = 42,577.94

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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.