Home / 30,931.49-42,703.79-20,339.39

Finding the Fourth Proportional to 30,931.49, 42,703.79 and 20,339.39

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Solution

The fourth proportional to 30,931.49, 42,703.79 and 20,339.39 is: 28,080.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,931.49 : 42,703.79 = 20,339.39 : x
  2. Step 2: Convert to fraction form
    30,931.49/42,703.79 = 20,339.39/x
  3. Step 3: Cross multiply
    30,931.49x = 42,703.79 × 20,339.39
  4. Step 4: Simplify right side
    30,931.49x = 868,568,724.07
  5. Step 5: Solve for x
    x = 868,568,724.07/30,931.49
  6. Step 6: Final answer
    x = 28,080.41

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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.