Home / 811,428.36-1,217,842.38-313,142.28

Finding the Fourth Proportional to 811,428.36, 1,217,842.38 and 313,142.28

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Solution

The fourth proportional to 811,428.36, 1,217,842.38 and 313,142.28 is: 469,983.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,428.36 : 1,217,842.38 = 313,142.28 : x
  2. Step 2: Convert to fraction form
    811,428.36/1,217,842.38 = 313,142.28/x
  3. Step 3: Cross multiply
    811,428.36x = 1,217,842.38 × 313,142.28
  4. Step 4: Simplify right side
    811,428.36x = 381,357,939,553.83
  5. Step 5: Solve for x
    x = 381,357,939,553.83/811,428.36
  6. Step 6: Final answer
    x = 469,983.50

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1.5x scale

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.