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Finding the Fourth Proportional to 70,071.47, 105,125.21 and 20,155.48

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Solution

The fourth proportional to 70,071.47, 105,125.21 and 20,155.48 is: 30,238.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,071.47 : 105,125.21 = 20,155.48 : x
  2. Step 2: Convert to fraction form
    70,071.47/105,125.21 = 20,155.48/x
  3. Step 3: Cross multiply
    70,071.47x = 105,125.21 × 20,155.48
  4. Step 4: Simplify right side
    70,071.47x = 2,118,848,704.06
  5. Step 5: Solve for x
    x = 2,118,848,704.06/70,071.47
  6. Step 6: Final answer
    x = 30,238.39

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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.