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Finding the Fourth Proportional to 1,238.77, 1,709.82 and 707.95

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Solution

The fourth proportional to 1,238.77, 1,709.82 and 707.95 is: 977.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.77 : 1,709.82 = 707.95 : x
  2. Step 2: Convert to fraction form
    1,238.77/1,709.82 = 707.95/x
  3. Step 3: Cross multiply
    1,238.77x = 1,709.82 × 707.95
  4. Step 4: Simplify right side
    1,238.77x = 1,210,467.07
  5. Step 5: Solve for x
    x = 1,210,467.07/1,238.77
  6. Step 6: Final answer
    x = 977.15

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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.