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Finding the Fourth Proportional to 645,745.50, 891,136.95 and 355,390.49

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Solution

The fourth proportional to 645,745.50, 891,136.95 and 355,390.49 is: 490,443.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,745.50 : 891,136.95 = 355,390.49 : x
  2. Step 2: Convert to fraction form
    645,745.50/891,136.95 = 355,390.49/x
  3. Step 3: Cross multiply
    645,745.50x = 891,136.95 × 355,390.49
  4. Step 4: Simplify right side
    645,745.50x = 316,701,592,861.92
  5. Step 5: Solve for x
    x = 316,701,592,861.92/645,745.50
  6. Step 6: Final answer
    x = 490,443.36

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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.