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Finding the Fourth Proportional to 623.64, 860.42 and 387.76

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Solution

The fourth proportional to 623.64, 860.42 and 387.76 is: 534.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.64 : 860.42 = 387.76 : x
  2. Step 2: Convert to fraction form
    623.64/860.42 = 387.76/x
  3. Step 3: Cross multiply
    623.64x = 860.42 × 387.76
  4. Step 4: Simplify right side
    623.64x = 333,636.46
  5. Step 5: Solve for x
    x = 333,636.46/623.64
  6. Step 6: Final answer
    x = 534.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.