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Finding the Fourth Proportional to 623.76, 859.85 and 513.05

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Solution

The fourth proportional to 623.76, 859.85 and 513.05 is: 707.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.76 : 859.85 = 513.05 : x
  2. Step 2: Convert to fraction form
    623.76/859.85 = 513.05/x
  3. Step 3: Cross multiply
    623.76x = 859.85 × 513.05
  4. Step 4: Simplify right side
    623.76x = 441,146.04
  5. Step 5: Solve for x
    x = 441,146.04/623.76
  6. Step 6: Final answer
    x = 707.24

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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.