Home / 39,895.07-55,055.36-21,989.68

Finding the Fourth Proportional to 39,895.07, 55,055.36 and 21,989.68

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Solution

The fourth proportional to 39,895.07, 55,055.36 and 21,989.68 is: 30,345.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,895.07 : 55,055.36 = 21,989.68 : x
  2. Step 2: Convert to fraction form
    39,895.07/55,055.36 = 21,989.68/x
  3. Step 3: Cross multiply
    39,895.07x = 55,055.36 × 21,989.68
  4. Step 4: Simplify right side
    39,895.07x = 1,210,649,666.02
  5. Step 5: Solve for x
    x = 1,210,649,666.02/39,895.07
  6. Step 6: Final answer
    x = 30,345.85

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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.