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Finding the Fourth Proportional to 421,713.21, 581,978.76 and 230,726.60

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Solution

The fourth proportional to 421,713.21, 581,978.76 and 230,726.60 is: 318,410.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,713.21 : 581,978.76 = 230,726.60 : x
  2. Step 2: Convert to fraction form
    421,713.21/581,978.76 = 230,726.60/x
  3. Step 3: Cross multiply
    421,713.21x = 581,978.76 × 230,726.60
  4. Step 4: Simplify right side
    421,713.21x = 134,277,977,657.12
  5. Step 5: Solve for x
    x = 134,277,977,657.12/421,713.21
  6. Step 6: Final answer
    x = 318,410.65

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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.