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Finding the Fourth Proportional to 39,115.76, 53,978.79 and 21,652.55

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Solution

The fourth proportional to 39,115.76, 53,978.79 and 21,652.55 is: 29,879.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,115.76 : 53,978.79 = 21,652.55 : x
  2. Step 2: Convert to fraction form
    39,115.76/53,978.79 = 21,652.55/x
  3. Step 3: Cross multiply
    39,115.76x = 53,978.79 × 21,652.55
  4. Step 4: Simplify right side
    39,115.76x = 1,168,778,449.41
  5. Step 5: Solve for x
    x = 1,168,778,449.41/39,115.76
  6. Step 6: Final answer
    x = 29,879.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.