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Finding the Fourth Proportional to 20,652.54, 30,978.86 and 5,070.21

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Solution

The fourth proportional to 20,652.54, 30,978.86 and 5,070.21 is: 7,605.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,652.54 : 30,978.86 = 5,070.21 : x
  2. Step 2: Convert to fraction form
    20,652.54/30,978.86 = 5,070.21/x
  3. Step 3: Cross multiply
    20,652.54x = 30,978.86 × 5,070.21
  4. Step 4: Simplify right side
    20,652.54x = 157,069,300.41
  5. Step 5: Solve for x
    x = 157,069,300.41/20,652.54
  6. Step 6: Final answer
    x = 7,605.33

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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.