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Finding the Fourth Proportional to 128,632.80, 177,522.66 and 77,658.06

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Solution

The fourth proportional to 128,632.80, 177,522.66 and 77,658.06 is: 107,173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,632.80 : 177,522.66 = 77,658.06 : x
  2. Step 2: Convert to fraction form
    128,632.80/177,522.66 = 77,658.06/x
  3. Step 3: Cross multiply
    128,632.80x = 177,522.66 × 77,658.06
  4. Step 4: Simplify right side
    128,632.80x = 13,786,065,381.64
  5. Step 5: Solve for x
    x = 13,786,065,381.64/128,632.80
  6. Step 6: Final answer
    x = 107,173.80

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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.