Home / 12,945.20-17,870.40-9,759.80

Finding the Fourth Proportional to 12,945.20, 17,870.40 and 9,759.80

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Solution

The fourth proportional to 12,945.20, 17,870.40 and 9,759.80 is: 13,473.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,945.20 : 17,870.40 = 9,759.80 : x
  2. Step 2: Convert to fraction form
    12,945.20/17,870.40 = 9,759.80/x
  3. Step 3: Cross multiply
    12,945.20x = 17,870.40 × 9,759.80
  4. Step 4: Simplify right side
    12,945.20x = 174,411,529.92
  5. Step 5: Solve for x
    x = 174,411,529.92/12,945.20
  6. Step 6: Final answer
    x = 13,473.07

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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.