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Finding the Fourth Proportional to 639,913.40, 958,703.70 and 520,940.60

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Solution

The fourth proportional to 639,913.40, 958,703.70 and 520,940.60 is: 780,461.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,913.40 : 958,703.70 = 520,940.60 : x
  2. Step 2: Convert to fraction form
    639,913.40/958,703.70 = 520,940.60/x
  3. Step 3: Cross multiply
    639,913.40x = 958,703.70 × 520,940.60
  4. Step 4: Simplify right side
    639,913.40x = 499,427,680,700.22
  5. Step 5: Solve for x
    x = 499,427,680,700.22/639,913.40
  6. Step 6: Final answer
    x = 780,461.36

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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.