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Finding the Fourth Proportional to 1,188.90, 1,782.81 and 457.98

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Solution

The fourth proportional to 1,188.90, 1,782.81 and 457.98 is: 686.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.90 : 1,782.81 = 457.98 : x
  2. Step 2: Convert to fraction form
    1,188.90/1,782.81 = 457.98/x
  3. Step 3: Cross multiply
    1,188.90x = 1,782.81 × 457.98
  4. Step 4: Simplify right side
    1,188.90x = 816,491.32
  5. Step 5: Solve for x
    x = 816,491.32/1,188.90
  6. Step 6: Final answer
    x = 686.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.