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Finding the Fourth Proportional to 623.79, 860.36 and 402.98

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Solution

The fourth proportional to 623.79, 860.36 and 402.98 is: 555.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.79 : 860.36 = 402.98 : x
  2. Step 2: Convert to fraction form
    623.79/860.36 = 402.98/x
  3. Step 3: Cross multiply
    623.79x = 860.36 × 402.98
  4. Step 4: Simplify right side
    623.79x = 346,701.56
  5. Step 5: Solve for x
    x = 346,701.56/623.79
  6. Step 6: Final answer
    x = 555.80

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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.