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Finding the Fourth Proportional to 1,223.77, 1,835.71 and 390.92

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Solution

The fourth proportional to 1,223.77, 1,835.71 and 390.92 is: 586.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.77 : 1,835.71 = 390.92 : x
  2. Step 2: Convert to fraction form
    1,223.77/1,835.71 = 390.92/x
  3. Step 3: Cross multiply
    1,223.77x = 1,835.71 × 390.92
  4. Step 4: Simplify right side
    1,223.77x = 717,615.75
  5. Step 5: Solve for x
    x = 717,615.75/1,223.77
  6. Step 6: Final answer
    x = 586.40

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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.