Home / 100,905.13-139,221.36-70,243.87

Finding the Fourth Proportional to 100,905.13, 139,221.36 and 70,243.87

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Solution

The fourth proportional to 100,905.13, 139,221.36 and 70,243.87 is: 96,917.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,905.13 : 139,221.36 = 70,243.87 : x
  2. Step 2: Convert to fraction form
    100,905.13/139,221.36 = 70,243.87/x
  3. Step 3: Cross multiply
    100,905.13x = 139,221.36 × 70,243.87
  4. Step 4: Simplify right side
    100,905.13x = 9,779,446,416.96
  5. Step 5: Solve for x
    x = 9,779,446,416.96/100,905.13
  6. Step 6: Final answer
    x = 96,917.24

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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.