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Finding the Fourth Proportional to 321,240, 443,317.60 and 187,112.64

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Solution

The fourth proportional to 321,240, 443,317.60 and 187,112.64 is: 258,219.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,240 : 443,317.60 = 187,112.64 : x
  2. Step 2: Convert to fraction form
    321,240/443,317.60 = 187,112.64/x
  3. Step 3: Cross multiply
    321,240x = 443,317.60 × 187,112.64
  4. Step 4: Simplify right side
    321,240x = 82,950,326,494.46
  5. Step 5: Solve for x
    x = 82,950,326,494.46/321,240
  6. Step 6: Final answer
    x = 258,219.17

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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.