Home / 30,729.12-42,405.84-18,153.60

Finding the Fourth Proportional to 30,729.12, 42,405.84 and 18,153.60

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Solution

The fourth proportional to 30,729.12, 42,405.84 and 18,153.60 is: 25,051.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,729.12 : 42,405.84 = 18,153.60 : x
  2. Step 2: Convert to fraction form
    30,729.12/42,405.84 = 18,153.60/x
  3. Step 3: Cross multiply
    30,729.12x = 42,405.84 × 18,153.60
  4. Step 4: Simplify right side
    30,729.12x = 769,818,657.02
  5. Step 5: Solve for x
    x = 769,818,657.02/30,729.12
  6. Step 6: Final answer
    x = 25,051.76

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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.