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Finding the Fourth Proportional to 449,139.30, 672,724.80 and 390,090.30

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Solution

The fourth proportional to 449,139.30, 672,724.80 and 390,090.30 is: 584,280.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    449,139.30 : 672,724.80 = 390,090.30 : x
  2. Step 2: Convert to fraction form
    449,139.30/672,724.80 = 390,090.30/x
  3. Step 3: Cross multiply
    449,139.30x = 672,724.80 × 390,090.30
  4. Step 4: Simplify right side
    449,139.30x = 262,423,419,049.44
  5. Step 5: Solve for x
    x = 262,423,419,049.44/449,139.30
  6. Step 6: Final answer
    x = 584,280.69

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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.