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Finding the Fourth Proportional to 639,228.40, 958,178.40 and 259,986.40

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Solution

The fourth proportional to 639,228.40, 958,178.40 and 259,986.40 is: 389,709.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,228.40 : 958,178.40 = 259,986.40 : x
  2. Step 2: Convert to fraction form
    639,228.40/958,178.40 = 259,986.40/x
  3. Step 3: Cross multiply
    639,228.40x = 958,178.40 × 259,986.40
  4. Step 4: Simplify right side
    639,228.40x = 249,113,352,773.76
  5. Step 5: Solve for x
    x = 249,113,352,773.76/639,228.40
  6. Step 6: Final answer
    x = 389,709.46

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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.