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Finding the Fourth Proportional to 201,720.10, 302,580.15 and 91,128.10

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Solution

The fourth proportional to 201,720.10, 302,580.15 and 91,128.10 is: 136,692.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,720.10 : 302,580.15 = 91,128.10 : x
  2. Step 2: Convert to fraction form
    201,720.10/302,580.15 = 91,128.10/x
  3. Step 3: Cross multiply
    201,720.10x = 302,580.15 × 91,128.10
  4. Step 4: Simplify right side
    201,720.10x = 27,573,554,167.22
  5. Step 5: Solve for x
    x = 27,573,554,167.22/201,720.10
  6. Step 6: Final answer
    x = 136,692.15

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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.