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Finding the Fourth Proportional to 105,670.11, 145,839.69 and 65,396.85

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Solution

The fourth proportional to 105,670.11, 145,839.69 and 65,396.85 is: 90,256.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,670.11 : 145,839.69 = 65,396.85 : x
  2. Step 2: Convert to fraction form
    105,670.11/145,839.69 = 65,396.85/x
  3. Step 3: Cross multiply
    105,670.11x = 145,839.69 × 65,396.85
  4. Step 4: Simplify right side
    105,670.11x = 9,537,456,330.98
  5. Step 5: Solve for x
    x = 9,537,456,330.98/105,670.11
  6. Step 6: Final answer
    x = 90,256.90

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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.