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Finding the Fourth Proportional to 128,643.90, 180,363.90 and 128,643.90

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Solution

The fourth proportional to 128,643.90, 180,363.90 and 128,643.90 is: 180,363.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,643.90 : 180,363.90 = 128,643.90 : x
  2. Step 2: Convert to fraction form
    128,643.90/180,363.90 = 128,643.90/x
  3. Step 3: Cross multiply
    128,643.90x = 180,363.90 × 128,643.90
  4. Step 4: Simplify right side
    128,643.90x = 23,202,715,515.21
  5. Step 5: Solve for x
    x = 23,202,715,515.21/128,643.90
  6. Step 6: Final answer
    x = 180,363.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.