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Finding the Fourth Proportional to 428,561.74, 591,420.59 and 247,311.28

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Solution

The fourth proportional to 428,561.74, 591,420.59 and 247,311.28 is: 341,292.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,561.74 : 591,420.59 = 247,311.28 : x
  2. Step 2: Convert to fraction form
    428,561.74/591,420.59 = 247,311.28/x
  3. Step 3: Cross multiply
    428,561.74x = 591,420.59 × 247,311.28
  4. Step 4: Simplify right side
    428,561.74x = 146,264,983,131.26
  5. Step 5: Solve for x
    x = 146,264,983,131.26/428,561.74
  6. Step 6: Final answer
    x = 341,292.68

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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.