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Finding the Fourth Proportional to 623.04, 859.76 and 390.32

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Solution

The fourth proportional to 623.04, 859.76 and 390.32 is: 538.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.04 : 859.76 = 390.32 : x
  2. Step 2: Convert to fraction form
    623.04/859.76 = 390.32/x
  3. Step 3: Cross multiply
    623.04x = 859.76 × 390.32
  4. Step 4: Simplify right side
    623.04x = 335,581.52
  5. Step 5: Solve for x
    x = 335,581.52/623.04
  6. Step 6: Final answer
    x = 538.62

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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.