Home / 319,985.40-478,811.70-291,991.80

Finding the Fourth Proportional to 319,985.40, 478,811.70 and 291,991.80

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Solution

The fourth proportional to 319,985.40, 478,811.70 and 291,991.80 is: 436,923.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,985.40 : 478,811.70 = 291,991.80 : x
  2. Step 2: Convert to fraction form
    319,985.40/478,811.70 = 291,991.80/x
  3. Step 3: Cross multiply
    319,985.40x = 478,811.70 × 291,991.80
  4. Step 4: Simplify right side
    319,985.40x = 139,809,090,144.06
  5. Step 5: Solve for x
    x = 139,809,090,144.06/319,985.40
  6. Step 6: Final answer
    x = 436,923.34

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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.