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Finding the Fourth Proportional to 1,212.95, 1,673.87 and 715.59

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Solution

The fourth proportional to 1,212.95, 1,673.87 and 715.59 is: 987.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.95 : 1,673.87 = 715.59 : x
  2. Step 2: Convert to fraction form
    1,212.95/1,673.87 = 715.59/x
  3. Step 3: Cross multiply
    1,212.95x = 1,673.87 × 715.59
  4. Step 4: Simplify right side
    1,212.95x = 1,197,804.63
  5. Step 5: Solve for x
    x = 1,197,804.63/1,212.95
  6. Step 6: Final answer
    x = 987.51

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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.