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Finding the Fourth Proportional to 39,894.51, 55,054.15 and 21,989.53

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Solution

The fourth proportional to 39,894.51, 55,054.15 and 21,989.53 is: 30,345.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,894.51 : 55,054.15 = 21,989.53 : x
  2. Step 2: Convert to fraction form
    39,894.51/55,054.15 = 21,989.53/x
  3. Step 3: Cross multiply
    39,894.51x = 55,054.15 × 21,989.53
  4. Step 4: Simplify right side
    39,894.51x = 1,210,614,883.05
  5. Step 5: Solve for x
    x = 1,210,614,883.05/39,894.51
  6. Step 6: Final answer
    x = 30,345.40

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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.