Home / 20,975.40-28,946.70-11,415.98

Finding the Fourth Proportional to 20,975.40, 28,946.70 and 11,415.98

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Solution

The fourth proportional to 20,975.40, 28,946.70 and 11,415.98 is: 15,754.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.40 : 28,946.70 = 11,415.98 : x
  2. Step 2: Convert to fraction form
    20,975.40/28,946.70 = 11,415.98/x
  3. Step 3: Cross multiply
    20,975.40x = 28,946.70 × 11,415.98
  4. Step 4: Simplify right side
    20,975.40x = 330,455,020.63
  5. Step 5: Solve for x
    x = 330,455,020.63/20,975.40
  6. Step 6: Final answer
    x = 15,754.41

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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.