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Finding the Fourth Proportional to 128,618.98, 192,928.54 and 53,698.28

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Solution

The fourth proportional to 128,618.98, 192,928.54 and 53,698.28 is: 80,547.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,618.98 : 192,928.54 = 53,698.28 : x
  2. Step 2: Convert to fraction form
    128,618.98/192,928.54 = 53,698.28/x
  3. Step 3: Cross multiply
    128,618.98x = 192,928.54 × 53,698.28
  4. Step 4: Simplify right side
    128,618.98x = 10,359,930,586.87
  5. Step 5: Solve for x
    x = 10,359,930,586.87/128,618.98
  6. Step 6: Final answer
    x = 80,547.45

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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.