Home / 128,679.51-177,572.91-71,317.35

Finding the Fourth Proportional to 128,679.51, 177,572.91 and 71,317.35

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Solution

The fourth proportional to 128,679.51, 177,572.91 and 71,317.35 is: 98,415.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,679.51 : 177,572.91 = 71,317.35 : x
  2. Step 2: Convert to fraction form
    128,679.51/177,572.91 = 71,317.35/x
  3. Step 3: Cross multiply
    128,679.51x = 177,572.91 × 71,317.35
  4. Step 4: Simplify right side
    128,679.51x = 12,664,029,372.99
  5. Step 5: Solve for x
    x = 12,664,029,372.99/128,679.51
  6. Step 6: Final answer
    x = 98,415.28

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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.