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Finding the Fourth Proportional to 128,306.36, 177,063 and 71,717.69

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Solution

The fourth proportional to 128,306.36, 177,063 and 71,717.69 is: 98,970.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,306.36 : 177,063 = 71,717.69 : x
  2. Step 2: Convert to fraction form
    128,306.36/177,063 = 71,717.69/x
  3. Step 3: Cross multiply
    128,306.36x = 177,063 × 71,717.69
  4. Step 4: Simplify right side
    128,306.36x = 12,698,549,344.47
  5. Step 5: Solve for x
    x = 12,698,549,344.47/128,306.36
  6. Step 6: Final answer
    x = 98,970.54

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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.