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Finding the Fourth Proportional to 128,726.88, 193,080.70 and 65,507.50

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Solution

The fourth proportional to 128,726.88, 193,080.70 and 65,507.50 is: 98,256.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,726.88 : 193,080.70 = 65,507.50 : x
  2. Step 2: Convert to fraction form
    128,726.88/193,080.70 = 65,507.50/x
  3. Step 3: Cross multiply
    128,726.88x = 193,080.70 × 65,507.50
  4. Step 4: Simplify right side
    128,726.88x = 12,648,233,955.25
  5. Step 5: Solve for x
    x = 12,648,233,955.25/128,726.88
  6. Step 6: Final answer
    x = 98,256.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.