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Finding the Fourth Proportional to 128,907.86, 177,925.55 and 88,088.51

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Solution

The fourth proportional to 128,907.86, 177,925.55 and 88,088.51 is: 121,584.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,907.86 : 177,925.55 = 88,088.51 : x
  2. Step 2: Convert to fraction form
    128,907.86/177,925.55 = 88,088.51/x
  3. Step 3: Cross multiply
    128,907.86x = 177,925.55 × 88,088.51
  4. Step 4: Simplify right side
    128,907.86x = 15,673,197,255.47
  5. Step 5: Solve for x
    x = 15,673,197,255.47/128,907.86
  6. Step 6: Final answer
    x = 121,584.49

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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.