Home / 100,638.72-138,881.45-55,319.63

Finding the Fourth Proportional to 100,638.72, 138,881.45 and 55,319.63

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Solution

The fourth proportional to 100,638.72, 138,881.45 and 55,319.63 is: 76,341.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,638.72 : 138,881.45 = 55,319.63 : x
  2. Step 2: Convert to fraction form
    100,638.72/138,881.45 = 55,319.63/x
  3. Step 3: Cross multiply
    100,638.72x = 138,881.45 × 55,319.63
  4. Step 4: Simplify right side
    100,638.72x = 7,682,869,871.76
  5. Step 5: Solve for x
    x = 7,682,869,871.76/100,638.72
  6. Step 6: Final answer
    x = 76,341.09

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1.5x scale

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.