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Finding the Fourth Proportional to 857.68, 1,290.17 and 777.49

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Solution

The fourth proportional to 857.68, 1,290.17 and 777.49 is: 1,169.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.68 : 1,290.17 = 777.49 : x
  2. Step 2: Convert to fraction form
    857.68/1,290.17 = 777.49/x
  3. Step 3: Cross multiply
    857.68x = 1,290.17 × 777.49
  4. Step 4: Simplify right side
    857.68x = 1,003,094.27
  5. Step 5: Solve for x
    x = 1,003,094.27/857.68
  6. Step 6: Final answer
    x = 1,169.54

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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.