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Finding the Fourth Proportional to 128,592.12, 192,817.71 and 39,820.98

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Solution

The fourth proportional to 128,592.12, 192,817.71 and 39,820.98 is: 59,709.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,592.12 : 192,817.71 = 39,820.98 : x
  2. Step 2: Convert to fraction form
    128,592.12/192,817.71 = 39,820.98/x
  3. Step 3: Cross multiply
    128,592.12x = 192,817.71 × 39,820.98
  4. Step 4: Simplify right side
    128,592.12x = 7,678,191,045.95
  5. Step 5: Solve for x
    x = 7,678,191,045.95/128,592.12
  6. Step 6: Final answer
    x = 59,709.65

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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.