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Finding the Fourth Proportional to 128,614.88, 192,922.32 and 69,478.40

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Solution

The fourth proportional to 128,614.88, 192,922.32 and 69,478.40 is: 104,217.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,614.88 : 192,922.32 = 69,478.40 : x
  2. Step 2: Convert to fraction form
    128,614.88/192,922.32 = 69,478.40/x
  3. Step 3: Cross multiply
    128,614.88x = 192,922.32 × 69,478.40
  4. Step 4: Simplify right side
    128,614.88x = 13,403,934,117.89
  5. Step 5: Solve for x
    x = 13,403,934,117.89/128,614.88
  6. Step 6: Final answer
    x = 104,217.60

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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.