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Finding the Fourth Proportional to 7,039.71, 9,714.69 and 4,245.21

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Solution

The fourth proportional to 7,039.71, 9,714.69 and 4,245.21 is: 5,858.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,039.71 : 9,714.69 = 4,245.21 : x
  2. Step 2: Convert to fraction form
    7,039.71/9,714.69 = 4,245.21/x
  3. Step 3: Cross multiply
    7,039.71x = 9,714.69 × 4,245.21
  4. Step 4: Simplify right side
    7,039.71x = 41,240,899.13
  5. Step 5: Solve for x
    x = 41,240,899.13/7,039.71
  6. Step 6: Final answer
    x = 5,858.32

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Half scale
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Double scale
Find fourth proportional to 7,040.71, 9,716.07 and 4,246.21
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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.