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Finding the Fourth Proportional to 813,040, 1,121,995.20 and 455,344

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Solution

The fourth proportional to 813,040, 1,121,995.20 and 455,344 is: 628,374.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,040 : 1,121,995.20 = 455,344 : x
  2. Step 2: Convert to fraction form
    813,040/1,121,995.20 = 455,344/x
  3. Step 3: Cross multiply
    813,040x = 1,121,995.20 × 455,344
  4. Step 4: Simplify right side
    813,040x = 510,893,782,348.80
  5. Step 5: Solve for x
    x = 510,893,782,348.80/813,040
  6. Step 6: Final answer
    x = 628,374.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.