Home / 189,780.21-261,683.06-129,386.07

Finding the Fourth Proportional to 189,780.21, 261,683.06 and 129,386.07

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Solution

The fourth proportional to 189,780.21, 261,683.06 and 129,386.07 is: 178,407.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,780.21 : 261,683.06 = 129,386.07 : x
  2. Step 2: Convert to fraction form
    189,780.21/261,683.06 = 129,386.07/x
  3. Step 3: Cross multiply
    189,780.21x = 261,683.06 × 129,386.07
  4. Step 4: Simplify right side
    189,780.21x = 33,858,142,072.04
  5. Step 5: Solve for x
    x = 33,858,142,072.04/189,780.21
  6. Step 6: Final answer
    x = 178,407.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.