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Finding the Fourth Proportional to 30,478.93, 45,718.41 and 20,015.05

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Solution

The fourth proportional to 30,478.93, 45,718.41 and 20,015.05 is: 30,022.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,478.93 : 45,718.41 = 20,015.05 : x
  2. Step 2: Convert to fraction form
    30,478.93/45,718.41 = 20,015.05/x
  3. Step 3: Cross multiply
    30,478.93x = 45,718.41 × 20,015.05
  4. Step 4: Simplify right side
    30,478.93x = 915,056,262.07
  5. Step 5: Solve for x
    x = 915,056,262.07/30,478.93
  6. Step 6: Final answer
    x = 30,022.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.