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Finding the Fourth Proportional to 1,214.32, 1,675.71 and 716.98

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Solution

The fourth proportional to 1,214.32, 1,675.71 and 716.98 is: 989.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.32 : 1,675.71 = 716.98 : x
  2. Step 2: Convert to fraction form
    1,214.32/1,675.71 = 716.98/x
  3. Step 3: Cross multiply
    1,214.32x = 1,675.71 × 716.98
  4. Step 4: Simplify right side
    1,214.32x = 1,201,450.56
  5. Step 5: Solve for x
    x = 1,201,450.56/1,214.32
  6. Step 6: Final answer
    x = 989.40

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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.