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Finding the Fourth Proportional to 390,187.40, 585,327.98 and 137,415.66

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Solution

The fourth proportional to 390,187.40, 585,327.98 and 137,415.66 is: 206,140.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,187.40 : 585,327.98 = 137,415.66 : x
  2. Step 2: Convert to fraction form
    390,187.40/585,327.98 = 137,415.66/x
  3. Step 3: Cross multiply
    390,187.40x = 585,327.98 × 137,415.66
  4. Step 4: Simplify right side
    390,187.40x = 80,433,230,001.09
  5. Step 5: Solve for x
    x = 80,433,230,001.09/390,187.40
  6. Step 6: Final answer
    x = 206,140.00

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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.