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Finding the Fourth Proportional to 172,955.20, 259,432.80 and 143,430.70

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Solution

The fourth proportional to 172,955.20, 259,432.80 and 143,430.70 is: 215,146.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,955.20 : 259,432.80 = 143,430.70 : x
  2. Step 2: Convert to fraction form
    172,955.20/259,432.80 = 143,430.70/x
  3. Step 3: Cross multiply
    172,955.20x = 259,432.80 × 143,430.70
  4. Step 4: Simplify right side
    172,955.20x = 37,210,628,106.96
  5. Step 5: Solve for x
    x = 37,210,628,106.96/172,955.20
  6. Step 6: Final answer
    x = 215,146.05

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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.