Home / 30,969.30-42,750.72-20,911.36

Finding the Fourth Proportional to 30,969.30, 42,750.72 and 20,911.36

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Solution

The fourth proportional to 30,969.30, 42,750.72 and 20,911.36 is: 28,866.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,969.30 : 42,750.72 = 20,911.36 : x
  2. Step 2: Convert to fraction form
    30,969.30/42,750.72 = 20,911.36/x
  3. Step 3: Cross multiply
    30,969.30x = 42,750.72 × 20,911.36
  4. Step 4: Simplify right side
    30,969.30x = 893,975,696.18
  5. Step 5: Solve for x
    x = 893,975,696.18/30,969.30
  6. Step 6: Final answer
    x = 28,866.51

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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.