Home / 5,518.21-7,615.10-3,128.63

Finding the Fourth Proportional to 5,518.21, 7,615.10 and 3,128.63

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Solution

The fourth proportional to 5,518.21, 7,615.10 and 3,128.63 is: 4,317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,518.21 : 7,615.10 = 3,128.63 : x
  2. Step 2: Convert to fraction form
    5,518.21/7,615.10 = 3,128.63/x
  3. Step 3: Cross multiply
    5,518.21x = 7,615.10 × 3,128.63
  4. Step 4: Simplify right side
    5,518.21x = 23,824,830.31
  5. Step 5: Solve for x
    x = 23,824,830.31/5,518.21
  6. Step 6: Final answer
    x = 4,317.49

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Half scale
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Double scale
Find fourth proportional to 5,519.21, 7,616.48 and 3,129.63
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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.