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Finding the Fourth Proportional to 125,155, 172,713.90 and 74,854

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Solution

The fourth proportional to 125,155, 172,713.90 and 74,854 is: 103,298.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,155 : 172,713.90 = 74,854 : x
  2. Step 2: Convert to fraction form
    125,155/172,713.90 = 74,854/x
  3. Step 3: Cross multiply
    125,155x = 172,713.90 × 74,854
  4. Step 4: Simplify right side
    125,155x = 12,928,326,270.60
  5. Step 5: Solve for x
    x = 12,928,326,270.60/125,155
  6. Step 6: Final answer
    x = 103,298.52

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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.