Home / 39,890.87-55,047.15-21,985.82

Finding the Fourth Proportional to 39,890.87, 55,047.15 and 21,985.82

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Solution

The fourth proportional to 39,890.87, 55,047.15 and 21,985.82 is: 30,339.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.87 : 55,047.15 = 21,985.82 : x
  2. Step 2: Convert to fraction form
    39,890.87/55,047.15 = 21,985.82/x
  3. Step 3: Cross multiply
    39,890.87x = 55,047.15 × 21,985.82
  4. Step 4: Simplify right side
    39,890.87x = 1,210,256,731.41
  5. Step 5: Solve for x
    x = 1,210,256,731.41/39,890.87
  6. Step 6: Final answer
    x = 30,339.19

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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.