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Finding the Fourth Proportional to 172,140.61, 258,210.40 and 45,780.75

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Solution

The fourth proportional to 172,140.61, 258,210.40 and 45,780.75 is: 68,670.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,140.61 : 258,210.40 = 45,780.75 : x
  2. Step 2: Convert to fraction form
    172,140.61/258,210.40 = 45,780.75/x
  3. Step 3: Cross multiply
    172,140.61x = 258,210.40 × 45,780.75
  4. Step 4: Simplify right side
    172,140.61x = 11,821,065,884.25
  5. Step 5: Solve for x
    x = 11,821,065,884.25/172,140.61
  6. Step 6: Final answer
    x = 68,670.99

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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.