Home / 39,890.11-55,048.69-21,985.16

Finding the Fourth Proportional to 39,890.11, 55,048.69 and 21,985.16

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Solution

The fourth proportional to 39,890.11, 55,048.69 and 21,985.16 is: 30,339.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.11 : 55,048.69 = 21,985.16 : x
  2. Step 2: Convert to fraction form
    39,890.11/55,048.69 = 21,985.16/x
  3. Step 3: Cross multiply
    39,890.11x = 55,048.69 × 21,985.16
  4. Step 4: Simplify right side
    39,890.11x = 1,210,254,257.44
  5. Step 5: Solve for x
    x = 1,210,254,257.44/39,890.11
  6. Step 6: Final answer
    x = 30,339.71

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Double scale
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Similar ratio
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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.