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Finding the Fourth Proportional to 128,239.70, 176,979.94 and 70,877.79

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Solution

The fourth proportional to 128,239.70, 176,979.94 and 70,877.79 is: 97,816.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.70 : 176,979.94 = 70,877.79 : x
  2. Step 2: Convert to fraction form
    128,239.70/176,979.94 = 70,877.79/x
  3. Step 3: Cross multiply
    128,239.70x = 176,979.94 × 70,877.79
  4. Step 4: Simplify right side
    128,239.70x = 12,543,946,136.63
  5. Step 5: Solve for x
    x = 12,543,946,136.63/128,239.70
  6. Step 6: Final answer
    x = 97,816.41

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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.