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Finding the Fourth Proportional to 1,212.60, 1,673.32 and 688.64

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Solution

The fourth proportional to 1,212.60, 1,673.32 and 688.64 is: 950.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.60 : 1,673.32 = 688.64 : x
  2. Step 2: Convert to fraction form
    1,212.60/1,673.32 = 688.64/x
  3. Step 3: Cross multiply
    1,212.60x = 1,673.32 × 688.64
  4. Step 4: Simplify right side
    1,212.60x = 1,152,315.08
  5. Step 5: Solve for x
    x = 1,152,315.08/1,212.60
  6. Step 6: Final answer
    x = 950.28

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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.