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Finding the Fourth Proportional to 614,725.20, 921,103.65 and 389,682.90

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Solution

The fourth proportional to 614,725.20, 921,103.65 and 389,682.90 is: 583,900.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    614,725.20 : 921,103.65 = 389,682.90 : x
  2. Step 2: Convert to fraction form
    614,725.20/921,103.65 = 389,682.90/x
  3. Step 3: Cross multiply
    614,725.20x = 921,103.65 × 389,682.90
  4. Step 4: Simplify right side
    614,725.20x = 358,938,341,532.59
  5. Step 5: Solve for x
    x = 358,938,341,532.59/614,725.20
  6. Step 6: Final answer
    x = 583,900.48

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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.