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Finding the Fourth Proportional to 70,409.84, 105,619.62 and 20,490.35

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Solution

The fourth proportional to 70,409.84, 105,619.62 and 20,490.35 is: 30,736.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,409.84 : 105,619.62 = 20,490.35 : x
  2. Step 2: Convert to fraction form
    70,409.84/105,619.62 = 20,490.35/x
  3. Step 3: Cross multiply
    70,409.84x = 105,619.62 × 20,490.35
  4. Step 4: Simplify right side
    70,409.84x = 2,164,182,980.67
  5. Step 5: Solve for x
    x = 2,164,182,980.67/70,409.84
  6. Step 6: Final answer
    x = 30,736.94

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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.