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Finding the Fourth Proportional to 421,126, 631,731.48 and 136,804.72

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Solution

The fourth proportional to 421,126, 631,731.48 and 136,804.72 is: 205,220.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,126 : 631,731.48 = 136,804.72 : x
  2. Step 2: Convert to fraction form
    421,126/631,731.48 = 136,804.72/x
  3. Step 3: Cross multiply
    421,126x = 631,731.48 × 136,804.72
  4. Step 4: Simplify right side
    421,126x = 86,423,848,236.59
  5. Step 5: Solve for x
    x = 86,423,848,236.59/421,126
  6. Step 6: Final answer
    x = 205,220.88

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1.5x scale

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.