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Finding the Fourth Proportional to 561,965.78, 775,518.90 and 307,311.50

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Solution

The fourth proportional to 561,965.78, 775,518.90 and 307,311.50 is: 424,093.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,965.78 : 775,518.90 = 307,311.50 : x
  2. Step 2: Convert to fraction form
    561,965.78/775,518.90 = 307,311.50/x
  3. Step 3: Cross multiply
    561,965.78x = 775,518.90 × 307,311.50
  4. Step 4: Simplify right side
    561,965.78x = 238,325,876,437.35
  5. Step 5: Solve for x
    x = 238,325,876,437.35/561,965.78
  6. Step 6: Final answer
    x = 424,093.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.