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Finding the Fourth Proportional to 1,237.79, 1,708.31 and 713.99

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Solution

The fourth proportional to 1,237.79, 1,708.31 and 713.99 is: 985.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.79 : 1,708.31 = 713.99 : x
  2. Step 2: Convert to fraction form
    1,237.79/1,708.31 = 713.99/x
  3. Step 3: Cross multiply
    1,237.79x = 1,708.31 × 713.99
  4. Step 4: Simplify right side
    1,237.79x = 1,219,716.26
  5. Step 5: Solve for x
    x = 1,219,716.26/1,237.79
  6. Step 6: Final answer
    x = 985.40

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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.