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Finding the Fourth Proportional to 125,112.78, 172,648.78 and 74,130.21

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Solution

The fourth proportional to 125,112.78, 172,648.78 and 74,130.21 is: 102,295.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,112.78 : 172,648.78 = 74,130.21 : x
  2. Step 2: Convert to fraction form
    125,112.78/172,648.78 = 74,130.21/x
  3. Step 3: Cross multiply
    125,112.78x = 172,648.78 × 74,130.21
  4. Step 4: Simplify right side
    125,112.78x = 12,798,490,317.64
  5. Step 5: Solve for x
    x = 12,798,490,317.64/125,112.78
  6. Step 6: Final answer
    x = 102,295.63

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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.