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Finding the Fourth Proportional to 85,420.63, 117,935.90 and 76,452.58

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Solution

The fourth proportional to 85,420.63, 117,935.90 and 76,452.58 is: 105,554.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,420.63 : 117,935.90 = 76,452.58 : x
  2. Step 2: Convert to fraction form
    85,420.63/117,935.90 = 76,452.58/x
  3. Step 3: Cross multiply
    85,420.63x = 117,935.90 × 76,452.58
  4. Step 4: Simplify right side
    85,420.63x = 9,016,503,829.62
  5. Step 5: Solve for x
    x = 9,016,503,829.62/85,420.63
  6. Step 6: Final answer
    x = 105,554.17

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1.5x scale

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.