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Finding the Fourth Proportional to 128,455.55, 192,299.43 and 77,700.98

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Solution

The fourth proportional to 128,455.55, 192,299.43 and 77,700.98 is: 116,319.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,455.55 : 192,299.43 = 77,700.98 : x
  2. Step 2: Convert to fraction form
    128,455.55/192,299.43 = 77,700.98/x
  3. Step 3: Cross multiply
    128,455.55x = 192,299.43 × 77,700.98
  4. Step 4: Simplify right side
    128,455.55x = 14,941,853,990.09
  5. Step 5: Solve for x
    x = 14,941,853,990.09/128,455.55
  6. Step 6: Final answer
    x = 116,319.25

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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.