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Finding the Fourth Proportional to 390,361.08, 538,699.27 and 218,285.29

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Solution

The fourth proportional to 390,361.08, 538,699.27 and 218,285.29 is: 301,234.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,361.08 : 538,699.27 = 218,285.29 : x
  2. Step 2: Convert to fraction form
    390,361.08/538,699.27 = 218,285.29/x
  3. Step 3: Cross multiply
    390,361.08x = 538,699.27 × 218,285.29
  4. Step 4: Simplify right side
    390,361.08x = 117,590,126,374.74
  5. Step 5: Solve for x
    x = 117,590,126,374.74/390,361.08
  6. Step 6: Final answer
    x = 301,234.25

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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.