Home / 30,412.80-45,622.08-12,639.72

Finding the Fourth Proportional to 30,412.80, 45,622.08 and 12,639.72

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Solution

The fourth proportional to 30,412.80, 45,622.08 and 12,639.72 is: 18,960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,412.80 : 45,622.08 = 12,639.72 : x
  2. Step 2: Convert to fraction form
    30,412.80/45,622.08 = 12,639.72/x
  3. Step 3: Cross multiply
    30,412.80x = 45,622.08 × 12,639.72
  4. Step 4: Simplify right side
    30,412.80x = 576,650,317.02
  5. Step 5: Solve for x
    x = 576,650,317.02/30,412.80
  6. Step 6: Final answer
    x = 18,960.78

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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.