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Finding the Fourth Proportional to 253,139.10, 379,709.01 and 103,379.40

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Solution

The fourth proportional to 253,139.10, 379,709.01 and 103,379.40 is: 155,069.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,139.10 : 379,709.01 = 103,379.40 : x
  2. Step 2: Convert to fraction form
    253,139.10/379,709.01 = 103,379.40/x
  3. Step 3: Cross multiply
    253,139.10x = 379,709.01 × 103,379.40
  4. Step 4: Simplify right side
    253,139.10x = 39,254,089,628.39
  5. Step 5: Solve for x
    x = 39,254,089,628.39/253,139.10
  6. Step 6: Final answer
    x = 155,069.25

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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.