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Finding the Fourth Proportional to 425,475.70, 638,213.55 and 390,046.30

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Solution

The fourth proportional to 425,475.70, 638,213.55 and 390,046.30 is: 585,069.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,475.70 : 638,213.55 = 390,046.30 : x
  2. Step 2: Convert to fraction form
    425,475.70/638,213.55 = 390,046.30/x
  3. Step 3: Cross multiply
    425,475.70x = 638,213.55 × 390,046.30
  4. Step 4: Simplify right side
    425,475.70x = 248,932,833,787.37
  5. Step 5: Solve for x
    x = 248,932,833,787.37/425,475.70
  6. Step 6: Final answer
    x = 585,069.45

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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.