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Finding the Fourth Proportional to 128,737.54, 177,624.45 and 77,709.94

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Solution

The fourth proportional to 128,737.54, 177,624.45 and 77,709.94 is: 107,219.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.54 : 177,624.45 = 77,709.94 : x
  2. Step 2: Convert to fraction form
    128,737.54/177,624.45 = 77,709.94/x
  3. Step 3: Cross multiply
    128,737.54x = 177,624.45 × 77,709.94
  4. Step 4: Simplify right side
    128,737.54x = 13,803,185,352.03
  5. Step 5: Solve for x
    x = 13,803,185,352.03/128,737.54
  6. Step 6: Final answer
    x = 107,219.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.