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Finding the Fourth Proportional to 390,139.75, 585,209.63 and 94,651.75

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Solution

The fourth proportional to 390,139.75, 585,209.63 and 94,651.75 is: 141,977.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,139.75 : 585,209.63 = 94,651.75 : x
  2. Step 2: Convert to fraction form
    390,139.75/585,209.63 = 94,651.75/x
  3. Step 3: Cross multiply
    390,139.75x = 585,209.63 × 94,651.75
  4. Step 4: Simplify right side
    390,139.75x = 55,391,115,596.35
  5. Step 5: Solve for x
    x = 55,391,115,596.35/390,139.75
  6. Step 6: Final answer
    x = 141,977.63

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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.