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Finding the Fourth Proportional to 210,221.09, 315,430.05 and 91,877.05

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Solution

The fourth proportional to 210,221.09, 315,430.05 and 91,877.05 is: 137,858.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,221.09 : 315,430.05 = 91,877.05 : x
  2. Step 2: Convert to fraction form
    210,221.09/315,430.05 = 91,877.05/x
  3. Step 3: Cross multiply
    210,221.09x = 315,430.05 × 91,877.05
  4. Step 4: Simplify right side
    210,221.09x = 28,980,782,475.35
  5. Step 5: Solve for x
    x = 28,980,782,475.35/210,221.09
  6. Step 6: Final answer
    x = 137,858.59

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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.