Home / 30,720.80-42,395.20-18,145.52

Finding the Fourth Proportional to 30,720.80, 42,395.20 and 18,145.52

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Solution

The fourth proportional to 30,720.80, 42,395.20 and 18,145.52 is: 25,041.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.80 : 42,395.20 = 18,145.52 : x
  2. Step 2: Convert to fraction form
    30,720.80/42,395.20 = 18,145.52/x
  3. Step 3: Cross multiply
    30,720.80x = 42,395.20 × 18,145.52
  4. Step 4: Simplify right side
    30,720.80x = 769,282,949.50
  5. Step 5: Solve for x
    x = 769,282,949.50/30,720.80
  6. Step 6: Final answer
    x = 25,041.11

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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.