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Finding the Fourth Proportional to 128,259.77, 176,994.86 and 71,671.14

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Solution

The fourth proportional to 128,259.77, 176,994.86 and 71,671.14 is: 98,904.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,259.77 : 176,994.86 = 71,671.14 : x
  2. Step 2: Convert to fraction form
    128,259.77/176,994.86 = 71,671.14/x
  3. Step 3: Cross multiply
    128,259.77x = 176,994.86 × 71,671.14
  4. Step 4: Simplify right side
    128,259.77x = 12,685,423,031.98
  5. Step 5: Solve for x
    x = 12,685,423,031.98/128,259.77
  6. Step 6: Final answer
    x = 98,904.15

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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.