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Finding the Fourth Proportional to 623.40, 930.27 and 515.40

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Solution

The fourth proportional to 623.40, 930.27 and 515.40 is: 769.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.40 : 930.27 = 515.40 : x
  2. Step 2: Convert to fraction form
    623.40/930.27 = 515.40/x
  3. Step 3: Cross multiply
    623.40x = 930.27 × 515.40
  4. Step 4: Simplify right side
    623.40x = 479,461.16
  5. Step 5: Solve for x
    x = 479,461.16/623.40
  6. Step 6: Final answer
    x = 769.11

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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.