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Finding the Fourth Proportional to 1,238.71, 1,709.45 and 714.78

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Solution

The fourth proportional to 1,238.71, 1,709.45 and 714.78 is: 986.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.71 : 1,709.45 = 714.78 : x
  2. Step 2: Convert to fraction form
    1,238.71/1,709.45 = 714.78/x
  3. Step 3: Cross multiply
    1,238.71x = 1,709.45 × 714.78
  4. Step 4: Simplify right side
    1,238.71x = 1,221,880.67
  5. Step 5: Solve for x
    x = 1,221,880.67/1,238.71
  6. Step 6: Final answer
    x = 986.41

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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.