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Finding the Fourth Proportional to 128,738.16, 177,662.16 and 72,153.18

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Solution

The fourth proportional to 128,738.16, 177,662.16 and 72,153.18 is: 99,573.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,738.16 : 177,662.16 = 72,153.18 : x
  2. Step 2: Convert to fraction form
    128,738.16/177,662.16 = 72,153.18/x
  3. Step 3: Cross multiply
    128,738.16x = 177,662.16 × 72,153.18
  4. Step 4: Simplify right side
    128,738.16x = 12,818,889,809.67
  5. Step 5: Solve for x
    x = 12,818,889,809.67/128,738.16
  6. Step 6: Final answer
    x = 99,573.35

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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.