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Finding the Fourth Proportional to 318,738.60, 478,820.70 and 266,250.60

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Solution

The fourth proportional to 318,738.60, 478,820.70 and 266,250.60 is: 399,971.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,738.60 : 478,820.70 = 266,250.60 : x
  2. Step 2: Convert to fraction form
    318,738.60/478,820.70 = 266,250.60/x
  3. Step 3: Cross multiply
    318,738.60x = 478,820.70 × 266,250.60
  4. Step 4: Simplify right side
    318,738.60x = 127,486,298,667.42
  5. Step 5: Solve for x
    x = 127,486,298,667.42/318,738.60
  6. Step 6: Final answer
    x = 399,971.32

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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.