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Finding the Fourth Proportional to 1,143.74, 1,707.06 and 986.87

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Solution

The fourth proportional to 1,143.74, 1,707.06 and 986.87 is: 1,472.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.74 : 1,707.06 = 986.87 : x
  2. Step 2: Convert to fraction form
    1,143.74/1,707.06 = 986.87/x
  3. Step 3: Cross multiply
    1,143.74x = 1,707.06 × 986.87
  4. Step 4: Simplify right side
    1,143.74x = 1,684,637.77
  5. Step 5: Solve for x
    x = 1,684,637.77/1,143.74
  6. Step 6: Final answer
    x = 1,472.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.