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Finding the Fourth Proportional to 623.55, 860.61 and 387.75

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Solution

The fourth proportional to 623.55, 860.61 and 387.75 is: 535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.55 : 860.61 = 387.75 : x
  2. Step 2: Convert to fraction form
    623.55/860.61 = 387.75/x
  3. Step 3: Cross multiply
    623.55x = 860.61 × 387.75
  4. Step 4: Simplify right side
    623.55x = 333,701.53
  5. Step 5: Solve for x
    x = 333,701.53/623.55
  6. Step 6: Final answer
    x = 535.16

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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.