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Finding the Fourth Proportional to 427,689.16, 641,191.21 and 214,347.56

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Solution

The fourth proportional to 427,689.16, 641,191.21 and 214,347.56 is: 321,349.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,689.16 : 641,191.21 = 214,347.56 : x
  2. Step 2: Convert to fraction form
    427,689.16/641,191.21 = 214,347.56/x
  3. Step 3: Cross multiply
    427,689.16x = 641,191.21 × 214,347.56
  4. Step 4: Simplify right side
    427,689.16x = 137,437,768,415.46
  5. Step 5: Solve for x
    x = 137,437,768,415.46/427,689.16
  6. Step 6: Final answer
    x = 321,349.66

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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.