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Finding the Fourth Proportional to 70,440.16, 105,663.48 and 28,858

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Solution

The fourth proportional to 70,440.16, 105,663.48 and 28,858 is: 43,288.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,440.16 : 105,663.48 = 28,858 : x
  2. Step 2: Convert to fraction form
    70,440.16/105,663.48 = 28,858/x
  3. Step 3: Cross multiply
    70,440.16x = 105,663.48 × 28,858
  4. Step 4: Simplify right side
    70,440.16x = 3,049,236,705.84
  5. Step 5: Solve for x
    x = 3,049,236,705.84/70,440.16
  6. Step 6: Final answer
    x = 43,288.33

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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.