Home / 129,389.31-178,547.63-72,789.75

Finding the Fourth Proportional to 129,389.31, 178,547.63 and 72,789.75

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Solution

The fourth proportional to 129,389.31, 178,547.63 and 72,789.75 is: 100,444.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,389.31 : 178,547.63 = 72,789.75 : x
  2. Step 2: Convert to fraction form
    129,389.31/178,547.63 = 72,789.75/x
  3. Step 3: Cross multiply
    129,389.31x = 178,547.63 × 72,789.75
  4. Step 4: Simplify right side
    129,389.31x = 12,996,436,986.84
  5. Step 5: Solve for x
    x = 12,996,436,986.84/129,389.31
  6. Step 6: Final answer
    x = 100,444.44

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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.