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Finding the Fourth Proportional to 128,391.31, 192,482.63 and 53,567.21

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Solution

The fourth proportional to 128,391.31, 192,482.63 and 53,567.21 is: 80,307.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,391.31 : 192,482.63 = 53,567.21 : x
  2. Step 2: Convert to fraction form
    128,391.31/192,482.63 = 53,567.21/x
  3. Step 3: Cross multiply
    128,391.31x = 192,482.63 × 53,567.21
  4. Step 4: Simplify right side
    128,391.31x = 10,310,757,876.81
  5. Step 5: Solve for x
    x = 10,310,757,876.81/128,391.31
  6. Step 6: Final answer
    x = 80,307.29

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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.