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Finding the Fourth Proportional to 835.84, 1,153.20 and 486.28

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Solution

The fourth proportional to 835.84, 1,153.20 and 486.28 is: 670.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.84 : 1,153.20 = 486.28 : x
  2. Step 2: Convert to fraction form
    835.84/1,153.20 = 486.28/x
  3. Step 3: Cross multiply
    835.84x = 1,153.20 × 486.28
  4. Step 4: Simplify right side
    835.84x = 560,778.10
  5. Step 5: Solve for x
    x = 560,778.10/835.84
  6. Step 6: Final answer
    x = 670.92

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1.5x scale

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.