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Finding the Fourth Proportional to 390,609.80, 539,091.18 and 218,537.30

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Solution

The fourth proportional to 390,609.80, 539,091.18 and 218,537.30 is: 301,609.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,609.80 : 539,091.18 = 218,537.30 : x
  2. Step 2: Convert to fraction form
    390,609.80/539,091.18 = 218,537.30/x
  3. Step 3: Cross multiply
    390,609.80x = 539,091.18 × 218,537.30
  4. Step 4: Simplify right side
    390,609.80x = 117,811,530,931.01
  5. Step 5: Solve for x
    x = 117,811,530,931.01/390,609.80
  6. Step 6: Final answer
    x = 301,609.26

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.