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Finding the Fourth Proportional to 652,254.20, 978,381.30 and 428,305.40

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Solution

The fourth proportional to 652,254.20, 978,381.30 and 428,305.40 is: 642,458.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,254.20 : 978,381.30 = 428,305.40 : x
  2. Step 2: Convert to fraction form
    652,254.20/978,381.30 = 428,305.40/x
  3. Step 3: Cross multiply
    652,254.20x = 978,381.30 × 428,305.40
  4. Step 4: Simplify right side
    652,254.20x = 419,045,994,049.02
  5. Step 5: Solve for x
    x = 419,045,994,049.02/652,254.20
  6. Step 6: Final answer
    x = 642,458.10

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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.