Home / 30,931.93-42,720.87-20,901.79

Finding the Fourth Proportional to 30,931.93, 42,720.87 and 20,901.79

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Solution

The fourth proportional to 30,931.93, 42,720.87 and 20,901.79 is: 28,867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,931.93 : 42,720.87 = 20,901.79 : x
  2. Step 2: Convert to fraction form
    30,931.93/42,720.87 = 20,901.79/x
  3. Step 3: Cross multiply
    30,931.93x = 42,720.87 × 20,901.79
  4. Step 4: Simplify right side
    30,931.93x = 892,942,653.36
  5. Step 5: Solve for x
    x = 892,942,653.36/30,931.93
  6. Step 6: Final answer
    x = 28,867.99

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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.