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Finding the Fourth Proportional to 623.39, 859.65 and 402.45

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Solution

The fourth proportional to 623.39, 859.65 and 402.45 is: 554.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.39 : 859.65 = 402.45 : x
  2. Step 2: Convert to fraction form
    623.39/859.65 = 402.45/x
  3. Step 3: Cross multiply
    623.39x = 859.65 × 402.45
  4. Step 4: Simplify right side
    623.39x = 345,966.14
  5. Step 5: Solve for x
    x = 345,966.14/623.39
  6. Step 6: Final answer
    x = 554.98

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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.