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Finding the Fourth Proportional to 292,991.40, 439,778.70 and 143,400.60

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Solution

The fourth proportional to 292,991.40, 439,778.70 and 143,400.60 is: 215,243.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    292,991.40 : 439,778.70 = 143,400.60 : x
  2. Step 2: Convert to fraction form
    292,991.40/439,778.70 = 143,400.60/x
  3. Step 3: Cross multiply
    292,991.40x = 439,778.70 × 143,400.60
  4. Step 4: Simplify right side
    292,991.40x = 63,064,529,447.22
  5. Step 5: Solve for x
    x = 63,064,529,447.22/292,991.40
  6. Step 6: Final answer
    x = 215,243.62

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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.