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Finding the Fourth Proportional to 210,239.80, 315,359.70 and 121,447.60

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Solution

The fourth proportional to 210,239.80, 315,359.70 and 121,447.60 is: 182,171.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,239.80 : 315,359.70 = 121,447.60 : x
  2. Step 2: Convert to fraction form
    210,239.80/315,359.70 = 121,447.60/x
  3. Step 3: Cross multiply
    210,239.80x = 315,359.70 × 121,447.60
  4. Step 4: Simplify right side
    210,239.80x = 38,299,678,701.72
  5. Step 5: Solve for x
    x = 38,299,678,701.72/210,239.80
  6. Step 6: Final answer
    x = 182,171.40

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1.5x scale

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.