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Finding the Fourth Proportional to 425,312.80, 638,660.40 and 307,808.80

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Solution

The fourth proportional to 425,312.80, 638,660.40 and 307,808.80 is: 462,213.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,312.80 : 638,660.40 = 307,808.80 : x
  2. Step 2: Convert to fraction form
    425,312.80/638,660.40 = 307,808.80/x
  3. Step 3: Cross multiply
    425,312.80x = 638,660.40 × 307,808.80
  4. Step 4: Simplify right side
    425,312.80x = 196,585,291,331.52
  5. Step 5: Solve for x
    x = 196,585,291,331.52/425,312.80
  6. Step 6: Final answer
    x = 462,213.44

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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.