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Finding the Fourth Proportional to 319,986.40, 478,813.20 and 291,992.80

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Solution

The fourth proportional to 319,986.40, 478,813.20 and 291,992.80 is: 436,924.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,986.40 : 478,813.20 = 291,992.80 : x
  2. Step 2: Convert to fraction form
    319,986.40/478,813.20 = 291,992.80/x
  3. Step 3: Cross multiply
    319,986.40x = 478,813.20 × 291,992.80
  4. Step 4: Simplify right side
    319,986.40x = 139,810,006,944.96
  5. Step 5: Solve for x
    x = 139,810,006,944.96/319,986.40
  6. Step 6: Final answer
    x = 436,924.84

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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.