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Finding the Fourth Proportional to 1,085.55, 1,628.39 and 355.13

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Solution

The fourth proportional to 1,085.55, 1,628.39 and 355.13 is: 532.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.55 : 1,628.39 = 355.13 : x
  2. Step 2: Convert to fraction form
    1,085.55/1,628.39 = 355.13/x
  3. Step 3: Cross multiply
    1,085.55x = 1,628.39 × 355.13
  4. Step 4: Simplify right side
    1,085.55x = 578,295.10
  5. Step 5: Solve for x
    x = 578,295.10/1,085.55
  6. Step 6: Final answer
    x = 532.72

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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.