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Finding the Fourth Proportional to 491,436.79, 678,392.01 and 330,385.25

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Solution

The fourth proportional to 491,436.79, 678,392.01 and 330,385.25 is: 456,072.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,436.79 : 678,392.01 = 330,385.25 : x
  2. Step 2: Convert to fraction form
    491,436.79/678,392.01 = 330,385.25/x
  3. Step 3: Cross multiply
    491,436.79x = 678,392.01 × 330,385.25
  4. Step 4: Simplify right side
    491,436.79x = 224,130,715,517.83
  5. Step 5: Solve for x
    x = 224,130,715,517.83/491,436.79
  6. Step 6: Final answer
    x = 456,072.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.