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Finding the Fourth Proportional to 128,518.98, 192,443.13 and 103,421.94

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Solution

The fourth proportional to 128,518.98, 192,443.13 and 103,421.94 is: 154,863.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.98 : 192,443.13 = 103,421.94 : x
  2. Step 2: Convert to fraction form
    128,518.98/192,443.13 = 103,421.94/x
  3. Step 3: Cross multiply
    128,518.98x = 192,443.13 × 103,421.94
  4. Step 4: Simplify right side
    128,518.98x = 19,902,841,844.27
  5. Step 5: Solve for x
    x = 19,902,841,844.27/128,518.98
  6. Step 6: Final answer
    x = 154,863.05

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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.