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Finding the Fourth Proportional to 201,707.40, 302,561.10 and 138,721.80

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Solution

The fourth proportional to 201,707.40, 302,561.10 and 138,721.80 is: 208,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,707.40 : 302,561.10 = 138,721.80 : x
  2. Step 2: Convert to fraction form
    201,707.40/302,561.10 = 138,721.80/x
  3. Step 3: Cross multiply
    201,707.40x = 302,561.10 × 138,721.80
  4. Step 4: Simplify right side
    201,707.40x = 41,971,820,401.98
  5. Step 5: Solve for x
    x = 41,971,820,401.98/201,707.40
  6. Step 6: Final answer
    x = 208,082.70

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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.