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Finding the Fourth Proportional to 128,310.86, 192,368.18 and 77,698.88

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Solution

The fourth proportional to 128,310.86, 192,368.18 and 77,698.88 is: 116,488.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,310.86 : 192,368.18 = 77,698.88 : x
  2. Step 2: Convert to fraction form
    128,310.86/192,368.18 = 77,698.88/x
  3. Step 3: Cross multiply
    128,310.86x = 192,368.18 × 77,698.88
  4. Step 4: Simplify right side
    128,310.86x = 14,946,792,133.64
  5. Step 5: Solve for x
    x = 14,946,792,133.64/128,310.86
  6. Step 6: Final answer
    x = 116,488.91

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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.