Home / 30,907.20-42,648.80-18,971.04

Finding the Fourth Proportional to 30,907.20, 42,648.80 and 18,971.04

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Solution

The fourth proportional to 30,907.20, 42,648.80 and 18,971.04 is: 26,178.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,907.20 : 42,648.80 = 18,971.04 : x
  2. Step 2: Convert to fraction form
    30,907.20/42,648.80 = 18,971.04/x
  3. Step 3: Cross multiply
    30,907.20x = 42,648.80 × 18,971.04
  4. Step 4: Simplify right side
    30,907.20x = 809,092,090.75
  5. Step 5: Solve for x
    x = 809,092,090.75/30,907.20
  6. Step 6: Final answer
    x = 26,178.11

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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.