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Finding the Fourth Proportional to 1,212.85, 1,673.68 and 715.51

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Solution

The fourth proportional to 1,212.85, 1,673.68 and 715.51 is: 987.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.85 : 1,673.68 = 715.51 : x
  2. Step 2: Convert to fraction form
    1,212.85/1,673.68 = 715.51/x
  3. Step 3: Cross multiply
    1,212.85x = 1,673.68 × 715.51
  4. Step 4: Simplify right side
    1,212.85x = 1,197,522.83
  5. Step 5: Solve for x
    x = 1,197,522.83/1,212.85
  6. Step 6: Final answer
    x = 987.37

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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.