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Finding the Fourth Proportional to 520,067.90, 780,101.85 and 319,738.70

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Solution

The fourth proportional to 520,067.90, 780,101.85 and 319,738.70 is: 479,608.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,067.90 : 780,101.85 = 319,738.70 : x
  2. Step 2: Convert to fraction form
    520,067.90/780,101.85 = 319,738.70/x
  3. Step 3: Cross multiply
    520,067.90x = 780,101.85 × 319,738.70
  4. Step 4: Simplify right side
    520,067.90x = 249,428,751,386.60
  5. Step 5: Solve for x
    x = 249,428,751,386.60/520,067.90
  6. Step 6: Final answer
    x = 479,608.05

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Double scale
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Similar ratio
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1.5x scale

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.