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Finding the Fourth Proportional to 128,430.72, 177,241.28 and 71,838.72

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Solution

The fourth proportional to 128,430.72, 177,241.28 and 71,838.72 is: 99,141.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,430.72 : 177,241.28 = 71,838.72 : x
  2. Step 2: Convert to fraction form
    128,430.72/177,241.28 = 71,838.72/x
  3. Step 3: Cross multiply
    128,430.72x = 177,241.28 × 71,838.72
  4. Step 4: Simplify right side
    128,430.72x = 12,732,786,686.36
  5. Step 5: Solve for x
    x = 12,732,786,686.36/128,430.72
  6. Step 6: Final answer
    x = 99,141.29

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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.