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Finding the Fourth Proportional to 1,039.70, 1,433.17 and 707.56

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Solution

The fourth proportional to 1,039.70, 1,433.17 and 707.56 is: 975.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.70 : 1,433.17 = 707.56 : x
  2. Step 2: Convert to fraction form
    1,039.70/1,433.17 = 707.56/x
  3. Step 3: Cross multiply
    1,039.70x = 1,433.17 × 707.56
  4. Step 4: Simplify right side
    1,039.70x = 1,014,051.07
  5. Step 5: Solve for x
    x = 1,014,051.07/1,039.70
  6. Step 6: Final answer
    x = 975.33

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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.