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Finding the Fourth Proportional to 172,013.20, 258,019.80 and 45,653.20

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Solution

The fourth proportional to 172,013.20, 258,019.80 and 45,653.20 is: 68,479.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,013.20 : 258,019.80 = 45,653.20 : x
  2. Step 2: Convert to fraction form
    172,013.20/258,019.80 = 45,653.20/x
  3. Step 3: Cross multiply
    172,013.20x = 258,019.80 × 45,653.20
  4. Step 4: Simplify right side
    172,013.20x = 11,779,429,533.36
  5. Step 5: Solve for x
    x = 11,779,429,533.36/172,013.20
  6. Step 6: Final answer
    x = 68,479.80

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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.