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Finding the Fourth Proportional to 623.14, 859.80 and 390.13

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Solution

The fourth proportional to 623.14, 859.80 and 390.13 is: 538.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.14 : 859.80 = 390.13 : x
  2. Step 2: Convert to fraction form
    623.14/859.80 = 390.13/x
  3. Step 3: Cross multiply
    623.14x = 859.80 × 390.13
  4. Step 4: Simplify right side
    623.14x = 335,429.48
  5. Step 5: Solve for x
    x = 335,429.48/623.14
  6. Step 6: Final answer
    x = 538.29

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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.