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Finding the Fourth Proportional to 128,475.84, 192,647.34 and 56,399.25

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Solution

The fourth proportional to 128,475.84, 192,647.34 and 56,399.25 is: 84,569.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,475.84 : 192,647.34 = 56,399.25 : x
  2. Step 2: Convert to fraction form
    128,475.84/192,647.34 = 56,399.25/x
  3. Step 3: Cross multiply
    128,475.84x = 192,647.34 × 56,399.25
  4. Step 4: Simplify right side
    128,475.84x = 10,865,165,490.50
  5. Step 5: Solve for x
    x = 10,865,165,490.50/128,475.84
  6. Step 6: Final answer
    x = 84,569.72

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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.