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Finding the Fourth Proportional to 39,886.80, 55,046.94 and 21,985.08

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Solution

The fourth proportional to 39,886.80, 55,046.94 and 21,985.08 is: 30,341.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,886.80 : 55,046.94 = 21,985.08 : x
  2. Step 2: Convert to fraction form
    39,886.80/55,046.94 = 21,985.08/x
  3. Step 3: Cross multiply
    39,886.80x = 55,046.94 × 21,985.08
  4. Step 4: Simplify right side
    39,886.80x = 1,210,211,379.66
  5. Step 5: Solve for x
    x = 1,210,211,379.66/39,886.80
  6. Step 6: Final answer
    x = 30,341.15

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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.