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Finding the Fourth Proportional to 128,751.16, 177,658.62 and 74,994.70

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Solution

The fourth proportional to 128,751.16, 177,658.62 and 74,994.70 is: 103,482.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,751.16 : 177,658.62 = 74,994.70 : x
  2. Step 2: Convert to fraction form
    128,751.16/177,658.62 = 74,994.70/x
  3. Step 3: Cross multiply
    128,751.16x = 177,658.62 × 74,994.70
  4. Step 4: Simplify right side
    128,751.16x = 13,323,454,021.02
  5. Step 5: Solve for x
    x = 13,323,454,021.02/128,751.16
  6. Step 6: Final answer
    x = 103,482.21

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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.