Home / 685,113.72-1,028,846.70-420,428.40

Finding the Fourth Proportional to 685,113.72, 1,028,846.70 and 420,428.40

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Solution

The fourth proportional to 685,113.72, 1,028,846.70 and 420,428.40 is: 631,364.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,113.72 : 1,028,846.70 = 420,428.40 : x
  2. Step 2: Convert to fraction form
    685,113.72/1,028,846.70 = 420,428.40/x
  3. Step 3: Cross multiply
    685,113.72x = 1,028,846.70 × 420,428.40
  4. Step 4: Simplify right side
    685,113.72x = 432,556,371,926.28
  5. Step 5: Solve for x
    x = 432,556,371,926.28/685,113.72
  6. Step 6: Final answer
    x = 631,364.34

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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.