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Finding the Fourth Proportional to 289,905.40, 434,858.10 and 76,672.90

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Solution

The fourth proportional to 289,905.40, 434,858.10 and 76,672.90 is: 115,009.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,905.40 : 434,858.10 = 76,672.90 : x
  2. Step 2: Convert to fraction form
    289,905.40/434,858.10 = 76,672.90/x
  3. Step 3: Cross multiply
    289,905.40x = 434,858.10 × 76,672.90
  4. Step 4: Simplify right side
    289,905.40x = 33,341,831,615.49
  5. Step 5: Solve for x
    x = 33,341,831,615.49/289,905.40
  6. Step 6: Final answer
    x = 115,009.35

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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.