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Finding the Fourth Proportional to 652,157.70, 978,236.55 and 428,208.90

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Solution

The fourth proportional to 652,157.70, 978,236.55 and 428,208.90 is: 642,313.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,157.70 : 978,236.55 = 428,208.90 : x
  2. Step 2: Convert to fraction form
    652,157.70/978,236.55 = 428,208.90/x
  3. Step 3: Cross multiply
    652,157.70x = 978,236.55 × 428,208.90
  4. Step 4: Simplify right side
    652,157.70x = 418,889,597,015.30
  5. Step 5: Solve for x
    x = 418,889,597,015.30/652,157.70
  6. Step 6: Final answer
    x = 642,313.35

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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.