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Finding the Fourth Proportional to 128,759.63, 177,689.50 and 72,172.22

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Solution

The fourth proportional to 128,759.63, 177,689.50 and 72,172.22 is: 99,598.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,759.63 : 177,689.50 = 72,172.22 : x
  2. Step 2: Convert to fraction form
    128,759.63/177,689.50 = 72,172.22/x
  3. Step 3: Cross multiply
    128,759.63x = 177,689.50 × 72,172.22
  4. Step 4: Simplify right side
    128,759.63x = 12,824,244,616.81
  5. Step 5: Solve for x
    x = 12,824,244,616.81/128,759.63
  6. Step 6: Final answer
    x = 99,598.34

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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.