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Finding the Fourth Proportional to 201,638.80, 302,458.20 and 139,430.80

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Solution

The fourth proportional to 201,638.80, 302,458.20 and 139,430.80 is: 209,146.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,638.80 : 302,458.20 = 139,430.80 : x
  2. Step 2: Convert to fraction form
    201,638.80/302,458.20 = 139,430.80/x
  3. Step 3: Cross multiply
    201,638.80x = 302,458.20 × 139,430.80
  4. Step 4: Simplify right side
    201,638.80x = 42,171,988,792.56
  5. Step 5: Solve for x
    x = 42,171,988,792.56/201,638.80
  6. Step 6: Final answer
    x = 209,146.20

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1.5x scale

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.