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Finding the Fourth Proportional to 100,904.63, 139,220.67 and 70,243.37

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Solution

The fourth proportional to 100,904.63, 139,220.67 and 70,243.37 is: 96,916.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,904.63 : 139,220.67 = 70,243.37 : x
  2. Step 2: Convert to fraction form
    100,904.63/139,220.67 = 70,243.37/x
  3. Step 3: Cross multiply
    100,904.63x = 139,220.67 × 70,243.37
  4. Step 4: Simplify right side
    100,904.63x = 9,779,328,338.35
  5. Step 5: Solve for x
    x = 9,779,328,338.35/100,904.63
  6. Step 6: Final answer
    x = 96,916.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.