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Finding the Fourth Proportional to 421,518.90, 631,982.70 and 155,244.90

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Solution

The fourth proportional to 421,518.90, 631,982.70 and 155,244.90 is: 232,758.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,518.90 : 631,982.70 = 155,244.90 : x
  2. Step 2: Convert to fraction form
    421,518.90/631,982.70 = 155,244.90/x
  3. Step 3: Cross multiply
    421,518.90x = 631,982.70 × 155,244.90
  4. Step 4: Simplify right side
    421,518.90x = 98,112,091,063.23
  5. Step 5: Solve for x
    x = 98,112,091,063.23/421,518.90
  6. Step 6: Final answer
    x = 232,758.46

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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.