Home / 678,961.72-1,018,436.10-412,795.72

Finding the Fourth Proportional to 678,961.72, 1,018,436.10 and 412,795.72

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Solution

The fourth proportional to 678,961.72, 1,018,436.10 and 412,795.72 is: 619,189.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,961.72 : 1,018,436.10 = 412,795.72 : x
  2. Step 2: Convert to fraction form
    678,961.72/1,018,436.10 = 412,795.72/x
  3. Step 3: Cross multiply
    678,961.72x = 1,018,436.10 × 412,795.72
  4. Step 4: Simplify right side
    678,961.72x = 420,406,063,173.49
  5. Step 5: Solve for x
    x = 420,406,063,173.49/678,961.72
  6. Step 6: Final answer
    x = 619,189.64

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1.5x scale

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.