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Finding the Fourth Proportional to 1,238.60, 1,709.21 and 707.49

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Solution

The fourth proportional to 1,238.60, 1,709.21 and 707.49 is: 976.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.60 : 1,709.21 = 707.49 : x
  2. Step 2: Convert to fraction form
    1,238.60/1,709.21 = 707.49/x
  3. Step 3: Cross multiply
    1,238.60x = 1,709.21 × 707.49
  4. Step 4: Simplify right side
    1,238.60x = 1,209,248.98
  5. Step 5: Solve for x
    x = 1,209,248.98/1,238.60
  6. Step 6: Final answer
    x = 976.30

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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.