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Finding the Fourth Proportional to 139,670.40, 209,559.36 and 64,828.80

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Solution

The fourth proportional to 139,670.40, 209,559.36 and 64,828.80 is: 97,268.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,670.40 : 209,559.36 = 64,828.80 : x
  2. Step 2: Convert to fraction form
    139,670.40/209,559.36 = 64,828.80/x
  3. Step 3: Cross multiply
    139,670.40x = 209,559.36 × 64,828.80
  4. Step 4: Simplify right side
    139,670.40x = 13,585,481,837.57
  5. Step 5: Solve for x
    x = 13,585,481,837.57/139,670.40
  6. Step 6: Final answer
    x = 97,268.15

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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.