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Finding the Fourth Proportional to 172,999.40, 238,740.90 and 101,421.80

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Solution

The fourth proportional to 172,999.40, 238,740.90 and 101,421.80 is: 139,963.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,999.40 : 238,740.90 = 101,421.80 : x
  2. Step 2: Convert to fraction form
    172,999.40/238,740.90 = 101,421.80/x
  3. Step 3: Cross multiply
    172,999.40x = 238,740.90 × 101,421.80
  4. Step 4: Simplify right side
    172,999.40x = 24,213,531,811.62
  5. Step 5: Solve for x
    x = 24,213,531,811.62/172,999.40
  6. Step 6: Final answer
    x = 139,963.10

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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.