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Finding the Fourth Proportional to 259,368.40, 388,987.80 and 99,409.60

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Solution

The fourth proportional to 259,368.40, 388,987.80 and 99,409.60 is: 149,089.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,368.40 : 388,987.80 = 99,409.60 : x
  2. Step 2: Convert to fraction form
    259,368.40/388,987.80 = 99,409.60/x
  3. Step 3: Cross multiply
    259,368.40x = 388,987.80 × 99,409.60
  4. Step 4: Simplify right side
    259,368.40x = 38,669,121,602.88
  5. Step 5: Solve for x
    x = 38,669,121,602.88/259,368.40
  6. Step 6: Final answer
    x = 149,089.56

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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.