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Finding the Fourth Proportional to 405,453.80, 608,123.10 and 139,226.60

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Solution

The fourth proportional to 405,453.80, 608,123.10 and 139,226.60 is: 208,820.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,453.80 : 608,123.10 = 139,226.60 : x
  2. Step 2: Convert to fraction form
    405,453.80/608,123.10 = 139,226.60/x
  3. Step 3: Cross multiply
    405,453.80x = 608,123.10 × 139,226.60
  4. Step 4: Simplify right side
    405,453.80x = 84,666,911,594.46
  5. Step 5: Solve for x
    x = 84,666,911,594.46/405,453.80
  6. Step 6: Final answer
    x = 208,820.12

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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.