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Finding the Fourth Proportional to 421,214.40, 631,994.40 and 155,102.40

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Solution

The fourth proportional to 421,214.40, 631,994.40 and 155,102.40 is: 232,717.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,214.40 : 631,994.40 = 155,102.40 : x
  2. Step 2: Convert to fraction form
    421,214.40/631,994.40 = 155,102.40/x
  3. Step 3: Cross multiply
    421,214.40x = 631,994.40 × 155,102.40
  4. Step 4: Simplify right side
    421,214.40x = 98,023,848,226.56
  5. Step 5: Solve for x
    x = 98,023,848,226.56/421,214.40
  6. Step 6: Final answer
    x = 232,717.23

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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.