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Finding the Fourth Proportional to 319,991.80, 479,987.70 and 315,326.20

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Solution

The fourth proportional to 319,991.80, 479,987.70 and 315,326.20 is: 472,989.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,991.80 : 479,987.70 = 315,326.20 : x
  2. Step 2: Convert to fraction form
    319,991.80/479,987.70 = 315,326.20/x
  3. Step 3: Cross multiply
    319,991.80x = 479,987.70 × 315,326.20
  4. Step 4: Simplify right side
    319,991.80x = 151,352,697,487.74
  5. Step 5: Solve for x
    x = 151,352,697,487.74/319,991.80
  6. Step 6: Final answer
    x = 472,989.30

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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.