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Finding the Fourth Proportional to 391,368.45, 587,136.35 and 121,490.67

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Solution

The fourth proportional to 391,368.45, 587,136.35 and 121,490.67 is: 182,261.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,368.45 : 587,136.35 = 121,490.67 : x
  2. Step 2: Convert to fraction form
    391,368.45/587,136.35 = 121,490.67/x
  3. Step 3: Cross multiply
    391,368.45x = 587,136.35 × 121,490.67
  4. Step 4: Simplify right side
    391,368.45x = 71,331,588,542.85
  5. Step 5: Solve for x
    x = 71,331,588,542.85/391,368.45
  6. Step 6: Final answer
    x = 182,261.98

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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.