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Finding the Fourth Proportional to 425,318.80, 637,978.20 and 214,929.40

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Solution

The fourth proportional to 425,318.80, 637,978.20 and 214,929.40 is: 322,394.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,318.80 : 637,978.20 = 214,929.40 : x
  2. Step 2: Convert to fraction form
    425,318.80/637,978.20 = 214,929.40/x
  3. Step 3: Cross multiply
    425,318.80x = 637,978.20 × 214,929.40
  4. Step 4: Simplify right side
    425,318.80x = 137,120,271,739.08
  5. Step 5: Solve for x
    x = 137,120,271,739.08/425,318.80
  6. Step 6: Final answer
    x = 322,394.10

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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.