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Finding the Fourth Proportional to 128,615.88, 177,551.52 and 85,666.84

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Solution

The fourth proportional to 128,615.88, 177,551.52 and 85,666.84 is: 118,261.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,615.88 : 177,551.52 = 85,666.84 : x
  2. Step 2: Convert to fraction form
    128,615.88/177,551.52 = 85,666.84/x
  3. Step 3: Cross multiply
    128,615.88x = 177,551.52 × 85,666.84
  4. Step 4: Simplify right side
    128,615.88x = 15,210,277,655.60
  5. Step 5: Solve for x
    x = 15,210,277,655.60/128,615.88
  6. Step 6: Final answer
    x = 118,261.27

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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.