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Finding the Fourth Proportional to 857.51, 1,285.38 and 491.56

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Solution

The fourth proportional to 857.51, 1,285.38 and 491.56 is: 736.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.51 : 1,285.38 = 491.56 : x
  2. Step 2: Convert to fraction form
    857.51/1,285.38 = 491.56/x
  3. Step 3: Cross multiply
    857.51x = 1,285.38 × 491.56
  4. Step 4: Simplify right side
    857.51x = 631,841.39
  5. Step 5: Solve for x
    x = 631,841.39/857.51
  6. Step 6: Final answer
    x = 736.83

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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.