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Finding the Fourth Proportional to 421,808.40, 632,712.60 and 389,331.45

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Solution

The fourth proportional to 421,808.40, 632,712.60 and 389,331.45 is: 583,997.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,808.40 : 632,712.60 = 389,331.45 : x
  2. Step 2: Convert to fraction form
    421,808.40/632,712.60 = 389,331.45/x
  3. Step 3: Cross multiply
    421,808.40x = 632,712.60 × 389,331.45
  4. Step 4: Simplify right side
    421,808.40x = 246,334,913,991.27
  5. Step 5: Solve for x
    x = 246,334,913,991.27/421,808.40
  6. Step 6: Final answer
    x = 583,997.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.