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Finding the Fourth Proportional to 128,898.70, 177,943.71 and 81,225.34

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Solution

The fourth proportional to 128,898.70, 177,943.71 and 81,225.34 is: 112,130.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,898.70 : 177,943.71 = 81,225.34 : x
  2. Step 2: Convert to fraction form
    128,898.70/177,943.71 = 81,225.34/x
  3. Step 3: Cross multiply
    128,898.70x = 177,943.71 × 81,225.34
  4. Step 4: Simplify right side
    128,898.70x = 14,453,538,345.61
  5. Step 5: Solve for x
    x = 14,453,538,345.61/128,898.70
  6. Step 6: Final answer
    x = 112,130.99

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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.