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Finding the Fourth Proportional to 70,349.22, 105,519.65 and 20,428.25

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Solution

The fourth proportional to 70,349.22, 105,519.65 and 20,428.25 is: 30,641.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,349.22 : 105,519.65 = 20,428.25 : x
  2. Step 2: Convert to fraction form
    70,349.22/105,519.65 = 20,428.25/x
  3. Step 3: Cross multiply
    70,349.22x = 105,519.65 × 20,428.25
  4. Step 4: Simplify right side
    70,349.22x = 2,155,581,160.37
  5. Step 5: Solve for x
    x = 2,155,581,160.37/70,349.22
  6. Step 6: Final answer
    x = 30,641.15

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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.