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Finding the Fourth Proportional to 172,495.71, 258,721.65 and 128,187.09

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Solution

The fourth proportional to 172,495.71, 258,721.65 and 128,187.09 is: 192,264.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,495.71 : 258,721.65 = 128,187.09 : x
  2. Step 2: Convert to fraction form
    172,495.71/258,721.65 = 128,187.09/x
  3. Step 3: Cross multiply
    172,495.71x = 258,721.65 × 128,187.09
  4. Step 4: Simplify right side
    172,495.71x = 33,164,775,433.50
  5. Step 5: Solve for x
    x = 33,164,775,433.50/172,495.71
  6. Step 6: Final answer
    x = 192,264.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.