Home / 128,690.28-193,026-39,941.40

Finding the Fourth Proportional to 128,690.28, 193,026 and 39,941.40

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Solution

The fourth proportional to 128,690.28, 193,026 and 39,941.40 is: 59,909.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,690.28 : 193,026 = 39,941.40 : x
  2. Step 2: Convert to fraction form
    128,690.28/193,026 = 39,941.40/x
  3. Step 3: Cross multiply
    128,690.28x = 193,026 × 39,941.40
  4. Step 4: Simplify right side
    128,690.28x = 7,709,728,676.40
  5. Step 5: Solve for x
    x = 7,709,728,676.40/128,690.28
  6. Step 6: Final answer
    x = 59,909.18

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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.