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Finding the Fourth Proportional to 620,205.13, 930,440.20 and 215,409.86

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Solution

The fourth proportional to 620,205.13, 930,440.20 and 215,409.86 is: 323,160.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,205.13 : 930,440.20 = 215,409.86 : x
  2. Step 2: Convert to fraction form
    620,205.13/930,440.20 = 215,409.86/x
  3. Step 3: Cross multiply
    620,205.13x = 930,440.20 × 215,409.86
  4. Step 4: Simplify right side
    620,205.13x = 200,425,993,220.37
  5. Step 5: Solve for x
    x = 200,425,993,220.37/620,205.13
  6. Step 6: Final answer
    x = 323,160.81

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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.