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Finding the Fourth Proportional to 387,290.60, 534,459.97 and 215,207.89

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Solution

The fourth proportional to 387,290.60, 534,459.97 and 215,207.89 is: 296,986.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,290.60 : 534,459.97 = 215,207.89 : x
  2. Step 2: Convert to fraction form
    387,290.60/534,459.97 = 215,207.89/x
  3. Step 3: Cross multiply
    387,290.60x = 534,459.97 × 215,207.89
  4. Step 4: Simplify right side
    387,290.60x = 115,020,001,366.02
  5. Step 5: Solve for x
    x = 115,020,001,366.02/387,290.60
  6. Step 6: Final answer
    x = 296,986.30

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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.