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Finding the Fourth Proportional to 70,487.58, 105,721.08 and 20,554.26

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Solution

The fourth proportional to 70,487.58, 105,721.08 and 20,554.26 is: 30,828.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,487.58 : 105,721.08 = 20,554.26 : x
  2. Step 2: Convert to fraction form
    70,487.58/105,721.08 = 20,554.26/x
  3. Step 3: Cross multiply
    70,487.58x = 105,721.08 × 20,554.26
  4. Step 4: Simplify right side
    70,487.58x = 2,173,018,565.80
  5. Step 5: Solve for x
    x = 2,173,018,565.80/70,487.58
  6. Step 6: Final answer
    x = 30,828.39

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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.