Home / 135,298.89-186,750-78,721.20

Finding the Fourth Proportional to 135,298.89, 186,750 and 78,721.20

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Solution

The fourth proportional to 135,298.89, 186,750 and 78,721.20 is: 108,657.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,298.89 : 186,750 = 78,721.20 : x
  2. Step 2: Convert to fraction form
    135,298.89/186,750 = 78,721.20/x
  3. Step 3: Cross multiply
    135,298.89x = 186,750 × 78,721.20
  4. Step 4: Simplify right side
    135,298.89x = 14,701,184,100
  5. Step 5: Solve for x
    x = 14,701,184,100/135,298.89
  6. Step 6: Final answer
    x = 108,657.09

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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.