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Finding the Fourth Proportional to 1,148.40, 1,722.88 and 407.92

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Solution

The fourth proportional to 1,148.40, 1,722.88 and 407.92 is: 611.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.40 : 1,722.88 = 407.92 : x
  2. Step 2: Convert to fraction form
    1,148.40/1,722.88 = 407.92/x
  3. Step 3: Cross multiply
    1,148.40x = 1,722.88 × 407.92
  4. Step 4: Simplify right side
    1,148.40x = 702,797.21
  5. Step 5: Solve for x
    x = 702,797.21/1,148.40
  6. Step 6: Final answer
    x = 611.98

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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.