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Finding the Fourth Proportional to 128,617.88, 177,554.28 and 85,668.84

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Solution

The fourth proportional to 128,617.88, 177,554.28 and 85,668.84 is: 118,264.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,617.88 : 177,554.28 = 85,668.84 : x
  2. Step 2: Convert to fraction form
    128,617.88/177,554.28 = 85,668.84/x
  3. Step 3: Cross multiply
    128,617.88x = 177,554.28 × 85,668.84
  4. Step 4: Simplify right side
    128,617.88x = 15,210,869,204.64
  5. Step 5: Solve for x
    x = 15,210,869,204.64/128,617.88
  6. Step 6: Final answer
    x = 118,264.03

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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.