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Finding the Fourth Proportional to 448,081.20, 672,121.80 and 399,092.40

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Solution

The fourth proportional to 448,081.20, 672,121.80 and 399,092.40 is: 598,638.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    448,081.20 : 672,121.80 = 399,092.40 : x
  2. Step 2: Convert to fraction form
    448,081.20/672,121.80 = 399,092.40/x
  3. Step 3: Cross multiply
    448,081.20x = 672,121.80 × 399,092.40
  4. Step 4: Simplify right side
    448,081.20x = 268,238,702,254.32
  5. Step 5: Solve for x
    x = 268,238,702,254.32/448,081.20
  6. Step 6: Final answer
    x = 598,638.60

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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.