Home / 12,158.80-16,779.60-7,380.40

Finding the Fourth Proportional to 12,158.80, 16,779.60 and 7,380.40

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Solution

The fourth proportional to 12,158.80, 16,779.60 and 7,380.40 is: 10,185.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,158.80 : 16,779.60 = 7,380.40 : x
  2. Step 2: Convert to fraction form
    12,158.80/16,779.60 = 7,380.40/x
  3. Step 3: Cross multiply
    12,158.80x = 16,779.60 × 7,380.40
  4. Step 4: Simplify right side
    12,158.80x = 123,840,159.84
  5. Step 5: Solve for x
    x = 123,840,159.84/12,158.80
  6. Step 6: Final answer
    x = 10,185.23

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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.