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Finding the Fourth Proportional to 139,430.40, 209,260.80 and 64,665.60

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Solution

The fourth proportional to 139,430.40, 209,260.80 and 64,665.60 is: 97,051.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,430.40 : 209,260.80 = 64,665.60 : x
  2. Step 2: Convert to fraction form
    139,430.40/209,260.80 = 64,665.60/x
  3. Step 3: Cross multiply
    139,430.40x = 209,260.80 × 64,665.60
  4. Step 4: Simplify right side
    139,430.40x = 13,531,975,188.48
  5. Step 5: Solve for x
    x = 13,531,975,188.48/139,430.40
  6. Step 6: Final answer
    x = 97,051.83

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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.