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Finding the Fourth Proportional to 128,491.85, 177,148.87 and 105,437.23

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Solution

The fourth proportional to 128,491.85, 177,148.87 and 105,437.23 is: 145,363.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.85 : 177,148.87 = 105,437.23 : x
  2. Step 2: Convert to fraction form
    128,491.85/177,148.87 = 105,437.23/x
  3. Step 3: Cross multiply
    128,491.85x = 177,148.87 × 105,437.23
  4. Step 4: Simplify right side
    128,491.85x = 18,678,085,264.69
  5. Step 5: Solve for x
    x = 18,678,085,264.69/128,491.85
  6. Step 6: Final answer
    x = 145,363.97

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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.