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Finding the Fourth Proportional to 145,426.60, 218,139.90 and 139,205.80

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Solution

The fourth proportional to 145,426.60, 218,139.90 and 139,205.80 is: 208,808.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,426.60 : 218,139.90 = 139,205.80 : x
  2. Step 2: Convert to fraction form
    145,426.60/218,139.90 = 139,205.80/x
  3. Step 3: Cross multiply
    145,426.60x = 218,139.90 × 139,205.80
  4. Step 4: Simplify right side
    145,426.60x = 30,366,339,291.42
  5. Step 5: Solve for x
    x = 30,366,339,291.42/145,426.60
  6. Step 6: Final answer
    x = 208,808.70

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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.