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Finding the Fourth Proportional to 39,115.80, 53,980.02 and 21,210.68

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Solution

The fourth proportional to 39,115.80, 53,980.02 and 21,210.68 is: 29,270.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,115.80 : 53,980.02 = 21,210.68 : x
  2. Step 2: Convert to fraction form
    39,115.80/53,980.02 = 21,210.68/x
  3. Step 3: Cross multiply
    39,115.80x = 53,980.02 × 21,210.68
  4. Step 4: Simplify right side
    39,115.80x = 1,144,953,065.56
  5. Step 5: Solve for x
    x = 1,144,953,065.56/39,115.80
  6. Step 6: Final answer
    x = 29,270.86

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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.