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Finding the Fourth Proportional to 623.63, 860.90 and 402.95

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Solution

The fourth proportional to 623.63, 860.90 and 402.95 is: 556.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.63 : 860.90 = 402.95 : x
  2. Step 2: Convert to fraction form
    623.63/860.90 = 402.95/x
  3. Step 3: Cross multiply
    623.63x = 860.90 × 402.95
  4. Step 4: Simplify right side
    623.63x = 346,899.79
  5. Step 5: Solve for x
    x = 346,899.79/623.63
  6. Step 6: Final answer
    x = 556.26

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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.