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Finding the Fourth Proportional to 458,539.40, 687,809.10 and 427,435.40

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Solution

The fourth proportional to 458,539.40, 687,809.10 and 427,435.40 is: 641,153.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,539.40 : 687,809.10 = 427,435.40 : x
  2. Step 2: Convert to fraction form
    458,539.40/687,809.10 = 427,435.40/x
  3. Step 3: Cross multiply
    458,539.40x = 687,809.10 × 427,435.40
  4. Step 4: Simplify right side
    458,539.40x = 293,993,957,782.14
  5. Step 5: Solve for x
    x = 293,993,957,782.14/458,539.40
  6. Step 6: Final answer
    x = 641,153.10

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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.