Home / 1,085.45-1,628.05-315.95

Finding the Fourth Proportional to 1,085.45, 1,628.05 and 315.95

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Solution

The fourth proportional to 1,085.45, 1,628.05 and 315.95 is: 473.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.45 : 1,628.05 = 315.95 : x
  2. Step 2: Convert to fraction form
    1,085.45/1,628.05 = 315.95/x
  3. Step 3: Cross multiply
    1,085.45x = 1,628.05 × 315.95
  4. Step 4: Simplify right side
    1,085.45x = 514,382.40
  5. Step 5: Solve for x
    x = 514,382.40/1,085.45
  6. Step 6: Final answer
    x = 473.89

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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.