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Finding the Fourth Proportional to 459,915.20, 689,872.80 and 404,619.20

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Solution

The fourth proportional to 459,915.20, 689,872.80 and 404,619.20 is: 606,928.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,915.20 : 689,872.80 = 404,619.20 : x
  2. Step 2: Convert to fraction form
    459,915.20/689,872.80 = 404,619.20/x
  3. Step 3: Cross multiply
    459,915.20x = 689,872.80 × 404,619.20
  4. Step 4: Simplify right side
    459,915.20x = 279,135,780,437.76
  5. Step 5: Solve for x
    x = 279,135,780,437.76/459,915.20
  6. Step 6: Final answer
    x = 606,928.80

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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.