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Finding the Fourth Proportional to 1,239.12, 1,710.09 and 715.14

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Solution

The fourth proportional to 1,239.12, 1,710.09 and 715.14 is: 986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.12 : 1,710.09 = 715.14 : x
  2. Step 2: Convert to fraction form
    1,239.12/1,710.09 = 715.14/x
  3. Step 3: Cross multiply
    1,239.12x = 1,710.09 × 715.14
  4. Step 4: Simplify right side
    1,239.12x = 1,222,953.76
  5. Step 5: Solve for x
    x = 1,222,953.76/1,239.12
  6. Step 6: Final answer
    x = 986.95

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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.