Home / 7,515.90-11,269.80-3,128.40

Finding the Fourth Proportional to 7,515.90, 11,269.80 and 3,128.40

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Solution

The fourth proportional to 7,515.90, 11,269.80 and 3,128.40 is: 4,690.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,515.90 : 11,269.80 = 3,128.40 : x
  2. Step 2: Convert to fraction form
    7,515.90/11,269.80 = 3,128.40/x
  3. Step 3: Cross multiply
    7,515.90x = 11,269.80 × 3,128.40
  4. Step 4: Simplify right side
    7,515.90x = 35,256,442.32
  5. Step 5: Solve for x
    x = 35,256,442.32/7,515.90
  6. Step 6: Final answer
    x = 4,690.91

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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.