Home / 30,240.80-45,361.20-20,909.60

Finding the Fourth Proportional to 30,240.80, 45,361.20 and 20,909.60

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Solution

The fourth proportional to 30,240.80, 45,361.20 and 20,909.60 is: 31,364.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,240.80 : 45,361.20 = 20,909.60 : x
  2. Step 2: Convert to fraction form
    30,240.80/45,361.20 = 20,909.60/x
  3. Step 3: Cross multiply
    30,240.80x = 45,361.20 × 20,909.60
  4. Step 4: Simplify right side
    30,240.80x = 948,484,547.52
  5. Step 5: Solve for x
    x = 948,484,547.52/30,240.80
  6. Step 6: Final answer
    x = 31,364.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.