Home / 128,428.20-192,638.70-58,307.40

Finding the Fourth Proportional to 128,428.20, 192,638.70 and 58,307.40

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Solution

The fourth proportional to 128,428.20, 192,638.70 and 58,307.40 is: 87,459.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,428.20 : 192,638.70 = 58,307.40 : x
  2. Step 2: Convert to fraction form
    128,428.20/192,638.70 = 58,307.40/x
  3. Step 3: Cross multiply
    128,428.20x = 192,638.70 × 58,307.40
  4. Step 4: Simplify right side
    128,428.20x = 11,232,261,736.38
  5. Step 5: Solve for x
    x = 11,232,261,736.38/128,428.20
  6. Step 6: Final answer
    x = 87,459.47

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1.5x scale

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.