Home / 7,128.76-9,840.96-5,240.35

Finding the Fourth Proportional to 7,128.76, 9,840.96 and 5,240.35

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Solution

The fourth proportional to 7,128.76, 9,840.96 and 5,240.35 is: 7,234.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.76 : 9,840.96 = 5,240.35 : x
  2. Step 2: Convert to fraction form
    7,128.76/9,840.96 = 5,240.35/x
  3. Step 3: Cross multiply
    7,128.76x = 9,840.96 × 5,240.35
  4. Step 4: Simplify right side
    7,128.76x = 51,570,074.74
  5. Step 5: Solve for x
    x = 51,570,074.74/7,128.76
  6. Step 6: Final answer
    x = 7,234.09

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Half scale
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Double scale
Find fourth proportional to 7,129.76, 9,842.34 and 5,241.35
Similar ratio
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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.