Home / 103,638.35-155,457.53-71,981.53

Finding the Fourth Proportional to 103,638.35, 155,457.53 and 71,981.53

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Solution

The fourth proportional to 103,638.35, 155,457.53 and 71,981.53 is: 107,972.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.35 : 155,457.53 = 71,981.53 : x
  2. Step 2: Convert to fraction form
    103,638.35/155,457.53 = 71,981.53/x
  3. Step 3: Cross multiply
    103,638.35x = 155,457.53 × 71,981.53
  4. Step 4: Simplify right side
    103,638.35x = 11,190,070,859.42
  5. Step 5: Solve for x
    x = 11,190,070,859.42/103,638.35
  6. Step 6: Final answer
    x = 107,972.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.