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Finding the Fourth Proportional to 458,586.40, 687,296.40 and 408,431.20

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Solution

The fourth proportional to 458,586.40, 687,296.40 and 408,431.20 is: 612,127.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,586.40 : 687,296.40 = 408,431.20 : x
  2. Step 2: Convert to fraction form
    458,586.40/687,296.40 = 408,431.20/x
  3. Step 3: Cross multiply
    458,586.40x = 687,296.40 × 408,431.20
  4. Step 4: Simplify right side
    458,586.40x = 280,713,293,407.68
  5. Step 5: Solve for x
    x = 280,713,293,407.68/458,586.40
  6. Step 6: Final answer
    x = 612,127.38

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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.