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Finding the Fourth Proportional to 425,772.40, 638,658.60 and 405,036.40

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Solution

The fourth proportional to 425,772.40, 638,658.60 and 405,036.40 is: 607,554.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,772.40 : 638,658.60 = 405,036.40 : x
  2. Step 2: Convert to fraction form
    425,772.40/638,658.60 = 405,036.40/x
  3. Step 3: Cross multiply
    425,772.40x = 638,658.60 × 405,036.40
  4. Step 4: Simplify right side
    425,772.40x = 258,679,980,173.04
  5. Step 5: Solve for x
    x = 258,679,980,173.04/425,772.40
  6. Step 6: Final answer
    x = 607,554.60

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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.