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Finding the Fourth Proportional to 145,603.55, 200,899.65 and 81,918.11

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Solution

The fourth proportional to 145,603.55, 200,899.65 and 81,918.11 is: 113,028.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,603.55 : 200,899.65 = 81,918.11 : x
  2. Step 2: Convert to fraction form
    145,603.55/200,899.65 = 81,918.11/x
  3. Step 3: Cross multiply
    145,603.55x = 200,899.65 × 81,918.11
  4. Step 4: Simplify right side
    145,603.55x = 16,457,318,213.57
  5. Step 5: Solve for x
    x = 16,457,318,213.57/145,603.55
  6. Step 6: Final answer
    x = 113,028.28

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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.