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Finding the Fourth Proportional to 70,339.82, 105,520.16 and 20,420.33

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Solution

The fourth proportional to 70,339.82, 105,520.16 and 20,420.33 is: 30,633.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,339.82 : 105,520.16 = 20,420.33 : x
  2. Step 2: Convert to fraction form
    70,339.82/105,520.16 = 20,420.33/x
  3. Step 3: Cross multiply
    70,339.82x = 105,520.16 × 20,420.33
  4. Step 4: Simplify right side
    70,339.82x = 2,154,756,488.85
  5. Step 5: Solve for x
    x = 2,154,756,488.85/70,339.82
  6. Step 6: Final answer
    x = 30,633.52

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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.