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Finding the Fourth Proportional to 1,239.12, 1,710.03 and 715.02

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Solution

The fourth proportional to 1,239.12, 1,710.03 and 715.02 is: 986.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.12 : 1,710.03 = 715.02 : x
  2. Step 2: Convert to fraction form
    1,239.12/1,710.03 = 715.02/x
  3. Step 3: Cross multiply
    1,239.12x = 1,710.03 × 715.02
  4. Step 4: Simplify right side
    1,239.12x = 1,222,705.65
  5. Step 5: Solve for x
    x = 1,222,705.65/1,239.12
  6. Step 6: Final answer
    x = 986.75

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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.