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Finding the Fourth Proportional to 213,885.60, 320,828.40 and 143,383.20

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Solution

The fourth proportional to 213,885.60, 320,828.40 and 143,383.20 is: 215,074.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,885.60 : 320,828.40 = 143,383.20 : x
  2. Step 2: Convert to fraction form
    213,885.60/320,828.40 = 143,383.20/x
  3. Step 3: Cross multiply
    213,885.60x = 320,828.40 × 143,383.20
  4. Step 4: Simplify right side
    213,885.60x = 46,001,402,642.88
  5. Step 5: Solve for x
    x = 46,001,402,642.88/213,885.60
  6. Step 6: Final answer
    x = 215,074.80

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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.