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Finding the Fourth Proportional to 391,335, 540,042.30 and 212,487

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Solution

The fourth proportional to 391,335, 540,042.30 and 212,487 is: 293,232.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,335 : 540,042.30 = 212,487 : x
  2. Step 2: Convert to fraction form
    391,335/540,042.30 = 212,487/x
  3. Step 3: Cross multiply
    391,335x = 540,042.30 × 212,487
  4. Step 4: Simplify right side
    391,335x = 114,751,968,200.10
  5. Step 5: Solve for x
    x = 114,751,968,200.10/391,335
  6. Step 6: Final answer
    x = 293,232.06

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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.