Home / 30,905.26-42,642.10-20,852.35

Finding the Fourth Proportional to 30,905.26, 42,642.10 and 20,852.35

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Solution

The fourth proportional to 30,905.26, 42,642.10 and 20,852.35 is: 28,771.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,905.26 : 42,642.10 = 20,852.35 : x
  2. Step 2: Convert to fraction form
    30,905.26/42,642.10 = 20,852.35/x
  3. Step 3: Cross multiply
    30,905.26x = 42,642.10 × 20,852.35
  4. Step 4: Simplify right side
    30,905.26x = 889,187,913.40
  5. Step 5: Solve for x
    x = 889,187,913.40/30,905.26
  6. Step 6: Final answer
    x = 28,771.41

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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.