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Finding the Fourth Proportional to 405,915.20, 608,872.80 and 125,518.40

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Solution

The fourth proportional to 405,915.20, 608,872.80 and 125,518.40 is: 188,277.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,915.20 : 608,872.80 = 125,518.40 : x
  2. Step 2: Convert to fraction form
    405,915.20/608,872.80 = 125,518.40/x
  3. Step 3: Cross multiply
    405,915.20x = 608,872.80 × 125,518.40
  4. Step 4: Simplify right side
    405,915.20x = 76,424,739,659.52
  5. Step 5: Solve for x
    x = 76,424,739,659.52/405,915.20
  6. Step 6: Final answer
    x = 188,277.60

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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.