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Finding the Fourth Proportional to 1,212.55, 1,673.48 and 740.35

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Solution

The fourth proportional to 1,212.55, 1,673.48 and 740.35 is: 1,021.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.55 : 1,673.48 = 740.35 : x
  2. Step 2: Convert to fraction form
    1,212.55/1,673.48 = 740.35/x
  3. Step 3: Cross multiply
    1,212.55x = 1,673.48 × 740.35
  4. Step 4: Simplify right side
    1,212.55x = 1,238,955.81
  5. Step 5: Solve for x
    x = 1,238,955.81/1,212.55
  6. Step 6: Final answer
    x = 1,021.78

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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.