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Finding the Fourth Proportional to 1,245.28, 1,718.48 and 685.77

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Solution

The fourth proportional to 1,245.28, 1,718.48 and 685.77 is: 946.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.28 : 1,718.48 = 685.77 : x
  2. Step 2: Convert to fraction form
    1,245.28/1,718.48 = 685.77/x
  3. Step 3: Cross multiply
    1,245.28x = 1,718.48 × 685.77
  4. Step 4: Simplify right side
    1,245.28x = 1,178,482.03
  5. Step 5: Solve for x
    x = 1,178,482.03/1,245.28
  6. Step 6: Final answer
    x = 946.36

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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.