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Finding the Fourth Proportional to 128,466.80, 192,455.40 and 69,282.80

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Solution

The fourth proportional to 128,466.80, 192,455.40 and 69,282.80 is: 103,792.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,466.80 : 192,455.40 = 69,282.80 : x
  2. Step 2: Convert to fraction form
    128,466.80/192,455.40 = 69,282.80/x
  3. Step 3: Cross multiply
    128,466.80x = 192,455.40 × 69,282.80
  4. Step 4: Simplify right side
    128,466.80x = 13,333,848,987.12
  5. Step 5: Solve for x
    x = 13,333,848,987.12/128,466.80
  6. Step 6: Final answer
    x = 103,792.18

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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.