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Finding the Fourth Proportional to 521,885.64, 720,190.26 and 306,978.60

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Solution

The fourth proportional to 521,885.64, 720,190.26 and 306,978.60 is: 423,623.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,885.64 : 720,190.26 = 306,978.60 : x
  2. Step 2: Convert to fraction form
    521,885.64/720,190.26 = 306,978.60/x
  3. Step 3: Cross multiply
    521,885.64x = 720,190.26 × 306,978.60
  4. Step 4: Simplify right side
    521,885.64x = 221,082,997,748.44
  5. Step 5: Solve for x
    x = 221,082,997,748.44/521,885.64
  6. Step 6: Final answer
    x = 423,623.45

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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.