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Finding the Fourth Proportional to 1,686.74, 2,528.38 and 646.46

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Solution

The fourth proportional to 1,686.74, 2,528.38 and 646.46 is: 969.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.74 : 2,528.38 = 646.46 : x
  2. Step 2: Convert to fraction form
    1,686.74/2,528.38 = 646.46/x
  3. Step 3: Cross multiply
    1,686.74x = 2,528.38 × 646.46
  4. Step 4: Simplify right side
    1,686.74x = 1,634,496.53
  5. Step 5: Solve for x
    x = 1,634,496.53/1,686.74
  6. Step 6: Final answer
    x = 969.03

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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.