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Finding the Fourth Proportional to 827.55, 1,240.40 and 340.18

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Solution

The fourth proportional to 827.55, 1,240.40 and 340.18 is: 509.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.55 : 1,240.40 = 340.18 : x
  2. Step 2: Convert to fraction form
    827.55/1,240.40 = 340.18/x
  3. Step 3: Cross multiply
    827.55x = 1,240.40 × 340.18
  4. Step 4: Simplify right side
    827.55x = 421,957.02
  5. Step 5: Solve for x
    x = 421,957.02/827.55
  6. Step 6: Final answer
    x = 509.89

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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.