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Finding the Fourth Proportional to 639,281.40, 958,257.90 and 260,039.40

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Solution

The fourth proportional to 639,281.40, 958,257.90 and 260,039.40 is: 389,788.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,281.40 : 958,257.90 = 260,039.40 : x
  2. Step 2: Convert to fraction form
    639,281.40/958,257.90 = 260,039.40/x
  3. Step 3: Cross multiply
    639,281.40x = 958,257.90 × 260,039.40
  4. Step 4: Simplify right side
    639,281.40x = 249,184,809,361.26
  5. Step 5: Solve for x
    x = 249,184,809,361.26/639,281.40
  6. Step 6: Final answer
    x = 389,788.92

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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.