Home / 105,143.44-145,015.68-67,421.20

Finding the Fourth Proportional to 105,143.44, 145,015.68 and 67,421.20

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Solution

The fourth proportional to 105,143.44, 145,015.68 and 67,421.20 is: 92,988.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,143.44 : 145,015.68 = 67,421.20 : x
  2. Step 2: Convert to fraction form
    105,143.44/145,015.68 = 67,421.20/x
  3. Step 3: Cross multiply
    105,143.44x = 145,015.68 × 67,421.20
  4. Step 4: Simplify right side
    105,143.44x = 9,777,131,164.42
  5. Step 5: Solve for x
    x = 9,777,131,164.42/105,143.44
  6. Step 6: Final answer
    x = 92,988.50

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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.