Home / 30,930.93-42,719.49-20,900.79

Finding the Fourth Proportional to 30,930.93, 42,719.49 and 20,900.79

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Solution

The fourth proportional to 30,930.93, 42,719.49 and 20,900.79 is: 28,866.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,930.93 : 42,719.49 = 20,900.79 : x
  2. Step 2: Convert to fraction form
    30,930.93/42,719.49 = 20,900.79/x
  3. Step 3: Cross multiply
    30,930.93x = 42,719.49 × 20,900.79
  4. Step 4: Simplify right side
    30,930.93x = 892,871,089.40
  5. Step 5: Solve for x
    x = 892,871,089.40/30,930.93
  6. Step 6: Final answer
    x = 28,866.61

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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.