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Finding the Fourth Proportional to 391,653, 540,484.44 and 212,805

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Solution

The fourth proportional to 391,653, 540,484.44 and 212,805 is: 293,672.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,653 : 540,484.44 = 212,805 : x
  2. Step 2: Convert to fraction form
    391,653/540,484.44 = 212,805/x
  3. Step 3: Cross multiply
    391,653x = 540,484.44 × 212,805
  4. Step 4: Simplify right side
    391,653x = 115,017,791,254.20
  5. Step 5: Solve for x
    x = 115,017,791,254.20/391,653
  6. Step 6: Final answer
    x = 293,672.69

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Why These Related Problems?

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