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Finding the Fourth Proportional to 70,437.67, 105,673.78 and 20,518.22

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Solution

The fourth proportional to 70,437.67, 105,673.78 and 20,518.22 is: 30,782.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,437.67 : 105,673.78 = 20,518.22 : x
  2. Step 2: Convert to fraction form
    70,437.67/105,673.78 = 20,518.22/x
  3. Step 3: Cross multiply
    70,437.67x = 105,673.78 × 20,518.22
  4. Step 4: Simplify right side
    70,437.67x = 2,168,238,156.10
  5. Step 5: Solve for x
    x = 2,168,238,156.10/70,437.67
  6. Step 6: Final answer
    x = 30,782.37

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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.