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Finding the Fourth Proportional to 128,289.80, 192,405.54 and 61,688.36

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Solution

The fourth proportional to 128,289.80, 192,405.54 and 61,688.36 is: 92,518.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,289.80 : 192,405.54 = 61,688.36 : x
  2. Step 2: Convert to fraction form
    128,289.80/192,405.54 = 61,688.36/x
  3. Step 3: Cross multiply
    128,289.80x = 192,405.54 × 61,688.36
  4. Step 4: Simplify right side
    128,289.80x = 11,869,182,217.51
  5. Step 5: Solve for x
    x = 11,869,182,217.51/128,289.80
  6. Step 6: Final answer
    x = 92,518.52

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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.