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Finding the Fourth Proportional to 139,438.40, 209,272.80 and 64,673.60

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Solution

The fourth proportional to 139,438.40, 209,272.80 and 64,673.60 is: 97,063.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,438.40 : 209,272.80 = 64,673.60 : x
  2. Step 2: Convert to fraction form
    139,438.40/209,272.80 = 64,673.60/x
  3. Step 3: Cross multiply
    139,438.40x = 209,272.80 × 64,673.60
  4. Step 4: Simplify right side
    139,438.40x = 13,534,425,358.08
  5. Step 5: Solve for x
    x = 13,534,425,358.08/139,438.40
  6. Step 6: Final answer
    x = 97,063.83

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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.