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Finding the Fourth Proportional to 681,066.16, 939,789 and 390,662.68

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Solution

The fourth proportional to 681,066.16, 939,789 and 390,662.68 is: 539,067.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,066.16 : 939,789 = 390,662.68 : x
  2. Step 2: Convert to fraction form
    681,066.16/939,789 = 390,662.68/x
  3. Step 3: Cross multiply
    681,066.16x = 939,789 × 390,662.68
  4. Step 4: Simplify right side
    681,066.16x = 367,140,489,374.52
  5. Step 5: Solve for x
    x = 367,140,489,374.52/681,066.16
  6. Step 6: Final answer
    x = 539,067.29

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1.5x scale

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.