Home / 20,702.90-28,570.12-11,271.54

Finding the Fourth Proportional to 20,702.90, 28,570.12 and 11,271.54

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Solution

The fourth proportional to 20,702.90, 28,570.12 and 11,271.54 is: 15,554.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,702.90 : 28,570.12 = 11,271.54 : x
  2. Step 2: Convert to fraction form
    20,702.90/28,570.12 = 11,271.54/x
  3. Step 3: Cross multiply
    20,702.90x = 28,570.12 × 11,271.54
  4. Step 4: Simplify right side
    20,702.90x = 322,029,250.38
  5. Step 5: Solve for x
    x = 322,029,250.38/20,702.90
  6. Step 6: Final answer
    x = 15,554.79

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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.