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Finding the Fourth Proportional to 1,187.21, 1,638.05 and 714.72

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Solution

The fourth proportional to 1,187.21, 1,638.05 and 714.72 is: 986.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.21 : 1,638.05 = 714.72 : x
  2. Step 2: Convert to fraction form
    1,187.21/1,638.05 = 714.72/x
  3. Step 3: Cross multiply
    1,187.21x = 1,638.05 × 714.72
  4. Step 4: Simplify right side
    1,187.21x = 1,170,751.68
  5. Step 5: Solve for x
    x = 1,170,751.68/1,187.21
  6. Step 6: Final answer
    x = 986.14

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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.